Nihilism,Nietzsche and the Doppelganger Problem

Nihilism, Nietzsche and the Doppelganger Problem Was Nietzsche a nihilist? Yes, because, like J. L. Mackie, he was an error-theorist about morality, including the elitist morality to which he himself subscribed. But he was variously a diagnostician, an opponent and a survivor of certain other kinds of nihilism. Schacht argues that Nietzsche cannot have been an error theorist, since meta-ethical nihilism is inconsistent with the moral commitment that Nietzsche displayed. Schacht’s exegetical argument parallels the substantive argument (advocated in recent years by Wright and Blackburn) that Mackie’s error theory can’t be true because if it were, we would have to give up morality or give up moralizing. I answer this argument with a little bit of help from Nietzsche. I then pose a problem, the Doppelganger Problem, for the meta-ethical nihilism that I attribute to Mackie and Nietzsche. (If A is a moral proposition then not-A is a moral proposition: hence not all moral propositions can be false.) I solve the problem by reformulating the error theory and also deal with a variant of the problem, the Reinforced Doppelganger, glancing at a famous paper of Ronald Dworkin’s. Thus, whatever its demerits, the error theory, is not self-refuting, nor does it require us to give up morality.     

Mixed up about mixed worlds? Understanding Blackburn’s supervenience argument

Simon Blackburn’s supervenience argument—focusing on the mysterious “ban on mixed worlds”—is still subject to a variety of conflicting interpretations. In this paper, I hope to provide a defense of the argument that clarifies both the argument and the objections it must overcome. Many of the extant objections, I will argue, fail to engage the argument in its true form. And to counter the more compelling objections, it will be necessary to bring in additional argumentation that Blackburn himself does not clearly provide. One important upshot of this discussion is that moral realism is not the only target of the argument: it raises trouble for a variety of metaethical views wed to realist-friendly construals of moral evaluation. Rightly understood, this argument not only survives the prominent responses, but turns out to be more powerful than his critics and Blackburn himself have recognized.     

Has Plantinga “buried” Mackie’s logical argument from evil?

In seeking to undermine Mackie’s logical argument from evil, Plantinga assumes that Mackie’s argument regards it as a necessary truth that a wholly good God would eliminate all evil that he could eliminate. I argue that this is an interpretative mistake, and that Mackie is merely assuming that the theist believes that God’s goodness entails that God would eliminate all evil that he could eliminate. Once the difference between these two assumptions, and the implausibility of Plantinga’s assumption, are brought out, Plantinga’s celebrated critique of Mackie’s argument can be seen to be far less compelling than is often assumed to be the case.     

The error in the error theory

Moral error theory of the kind defended by J. L. Mackie and Richard Joyce is premised on two claims: (1) that moral judgements essentially presuppose that moral value has absolute authority, and (2) that this presupposition is false, because nothing has absolute authority. This paper accepts (2) but rejects (1). It is argued first that (1) is not the best explanation of the evidence from moral practice, and second that even if it were, the error theory would still be mistaken, because the assumption does not contaminate the meaning or truth-conditions of moral claims. These are determined by the essential application conditions for moral concepts, which are relational rather than absolute. An analogy is drawn between moral judgements and motion judgements.     

There’s Nothing Quasi About Quasi-Realism: Moral Realism as a Moral Doctrine

This paper seeks to clarify and defend the proposition that moral realism is best elaborated as a moral doctrine. I begin by upholding Ronald Dworkin’s anti-Archimedean critique of the error theory against some strictures by Michael Smith, and I then briefly suggest how a proponent of moral realism as a moral doctrine would respond to Smith’s defense of the Archimedeanism of expressivism. Thereafter, this paper moves to its chief endeavor. By differentiating clearly between expressivism and quasi-realism (or moral realism as a moral doctrine), the paper highlights both their distinctness and their compatibility. In so doing, it underscores the affinities between Blackburnian quasi-realism and moral realism as a moral doctrine. Finally, this paper contends—in line with my earlier work on these matters—that moral realism as a moral doctrine points to the need for some reorienting of meta-ethical enquiries rather than for the abandoning of them.     

On The Validity of a Simple Argument for Moral Error Theory

In The Myth of Morality Richard Joyce presents a simple and very influential argument for the truth of moral error theory. In this paper I point out that (i) the argument does not have the form Joyce attributes to it, (ii) the argument is not valid in an extensional propositional logic and (iii) on the most natural way of explicating the meanings of the involved terms, it remains invalid. I conclude that more explanation is needed if we are to accept this particular argument for moral error theory.     

Why inference to the best explanation doesn’t secure empirical grounds for mathematical platonism

Proponents of the explanatory indispensability argument for mathematical platonism maintain that claims about mathematical entities play an essential explanatory role in some of our best scientific explanations. They infer that the existence of mathematical entities is supported by way of inference to the best explanation from empirical phenomena and therefore that there are the same sort of empirical grounds for believing in mathematical entities as there are for believing in concrete unobservables such as quarks. I object that this inference depends on a false view of how abductive considerations mediate the transfer of empirical support. More specifically, I argue that even if inference to the best explanation is cogent, and claims about mathematical entities play an essential explanatory role in some of our best scientific explanations, it doesn’t follow that the empirical phenomena that license those explanations also provide empirical support for the claim that mathematical entities exist.

     

Explaining our Moral Reliability

I critically examine an evolutionary debunking argument against moral realism. The key premise of the argument is that there is no adequate explanation of our moral reliability. I search for the strongest version of the argument; this involves exploring how ‘adequate explanation’ could be understood such that the key premise comes out true. Finally, I give a reductio: in the sense in which there is no adequate explanation of our moral reliability, there is equally no adequate explanation of our inductive reliability. Thus, the argument that would debunk our moral views would also, absurdly, debunk all inductive reasoning.     

Artificial explanations: the epistemological interpretation of explanation in AI

In this paper I critically examine the notion of explanation used in artificial intelligence in general, and in the theory of belief revision in particular. I focus on two of the best known accounts in the literature: Pagnucco’s abductive expansion functions and Gärdenfors’ counterfactual analysis. I argue that both accounts are at odds with the way in which this notion has historically been understood in philosophy. They are also at odds with the explanatory strategies used in actual scientific practice. At the end of the paper I outline a set of desiderata for an epistemologically motivated, scientifically informed belief revision model for explanation.     

Possible Worlds for Modal Primitivists

Among the most remarkable developments in metaphysics since the 1950’s is the explosion of philosophical interest in possible worlds. This paper proposes an explanation of what possible worlds are, and argues that this proposal, the interpreted models conception, should be attractive to anyone who thinks that modal facts are primitive, and so not to be explained in terms of some non-modal notion of “possible world.” I articulate three constraints on any acceptable primitivist explanation of the nature of possible worlds, and show that the interpreted models conception meets the three constraints.     

Metaphysics and the Future-Like-Ours Argument Against Abortion

Don Marquis’s “future-like-ours” argument against the moral permissibility of abortion is widely considered the strongest anti-abortion argument in the philosophical literature. In this paper, I address the issue of whether the argument relies upon controversial metaphysical premises. It is widely thought that future-like-ours argument indeed relies upon controversial metaphysics, in that it must reject the psychological theory of personal identity. I argue that that thought is mistaken—the future-like-ours argument does not depend upon the rejection of such a theory. I suggest, however, that given a widely-accepted view about contraception and abstinence, the argument is committed to contentious metaphysics after all, as it relies upon a highly controversial assumption about mereology. This commitment is not only relevant for those who are inclined to endorse the argument but reject the mereological view in question, but in addition entails dialectical and epistemological liabilities for the argument, which on some views will be fatal to the argument’s overall success.     

Evolutionary Skepticism about Morality and Prudential Normativity

Debunking arguments aim at defeating the justification of a belief by revealing the belief to have a dubious genealogy. One prominent example of such a debunking argument is Richard Joyce’s evolutionary debunking explanation of morality. Joyce’s argument targets only our belief in moral facts, while our belief in prudential facts is exempt from his evolutionary critique. In this paper, I suggest that our belief in prudential facts falls victim to evolutionary debunking, too. Just as our moral sense can be explained in evolutionary terms, so presumably can our tendency to judge our actions in prudential terms. And if the evolutionary explanation of our moral sense has an undermining effect, then so does the evolutionary explanation of our belief in prudential facts. This also undermines moral fictionalism, the view that we have prudential reasons to maintain moral discourse as a fiction. I consider and refute four possible objections to the suggested debunking of our belief in prudential normativity.     

The Explanatory Ambitions of Moral Principles

Moral properties are explained by other properties. And moral principles tell us about moral properties. How are these two ideas related? In particular, is the truth of a given moral principle part of what explains why a given action has a given moral property? I argue “No.” If moral principles are merely concerned with the extension of moral properties across all possible worlds, then they cannot be partial explainers of facts about the instantiation of those properties, since in general necessitation does not suffice for explanation. And if moral principles are themselves about what explains the moral properties under their purview, then by their own lights they are not needed in order to explain those moral properties’ instantiation—unless, that is, the principles exhibit an objectionable form of metaphysical circularity. So moral principles cannot explain why individual actions have moral properties. Nor, I also argue, can they explain why certain other factors explain why those actions have the moral properties that they do, or in some other way govern or mediate such first‐order explanations of particular moral facts. When it comes to the explanation of an individual action's specific moral features, moral principles are explanatorily idle.     

The possibility of morality

Despite much discussion over the existence of moral facts, metaethicists have largely ignored the related question of their possibility. This paper addresses the issue from the moral error theorist’s perspective, and shows how the arguments that error theorists have produced against the existence of moral facts at this world, if sound, also show that moral facts are impossible, at least at worlds non-morally identical to our own and, on some versions of the error theory, at any world. So error theorists’ arguments warrant a stronger conclusion than has previously been noticed. This may appear to make them vulnerable to counterarguments that take the possibility of moral facts as a premise. However, I show that any such arguments would be question-begging.     

Ability-based objections to no-best-world arguments

In the space of possible worlds, there might be a best possible world (a uniquely best world or a world tied for best with some other worlds). Or, instead, for every possible world, there might be a better possible world. Suppose that the latter is true, i.e., that there is no best world. Many have thought that there is then an argument against the existence of God, i.e., the existence of an omnipotent, omniscient and morally perfect being; we will call such arguments no-best-world arguments. In this paper, we discuss ability-based objections to such arguments; an ability-based objection to a no-best world argument claims that the argument fails because one or more of its premises conflict with a plausible principle connecting the applicability of some type of moral evaluation to the agent’s possession of a relevant ability. In particular, we formulate and evaluate an important new ability-based objection to the most promising no-best world argument.     

Recognition,Freedom, and the Self in Fichte's Foundations of Natural Right

In this paper I present an interpretation of J. G. Fichte's transcendental argument for the necessity of mutual recognition (Anerkennung) in Foundations of Natural Right. Fichte's argument purports to show that, as a condition of the possibility of self‐consciousness, we must take ourselves to stand in relations of mutual recognition with other agents like ourselves. After reconstructing the steps of Fichte's argument, I present what I call the ‘modal dilemma’, which highlights a serious ambiguity in Fichte's deduction. According to the modal dilemma, the conclusion to Fichte's transcendental argument—that as a condition of the possibility of our self‐consciousness, we must recognize and be recognized by others—expresses either metaphysical or normative necessity. However, no normative conclusion follows from Fichte's premises, and the metaphysical claim that does follow from his argument appears to be implausibly strong. Thus the argument looks like a failure on either interpretation of the conclusion's modality. In the penultimate section of the paper, I propose a new interpretation of the argument that avoids the modal dilemma and provides a normative grounding of Fichte's concept of right.     

Hegel's Essentialism. Natural Kinds and the Metaphysics of Explanation in Hegel's Theory of ‘the Concept’

Several recent interpretations see Hegel's theory of the Concept as a form of conceptual realism, according to which finite reality is articulated by objectively existing concepts. More precisely, this theory has been interpreted as a version of natural kind essentialism, and it has been proposed that its function is to account for the possibility of genuine explanations. This suggests a promising way to reconstruct the argument that Hegel's theory of objective concepts is based on—an argument that shows that the possibility of explanation rests on metaphysical preconditions and that natural kind essentialism gives the only adequate account of those preconditions. But in order for such a reconstruction to be successful, one needs to spell out the metaphysical features in virtue of which Hegelian natural kinds can account for the possibility of explanation. The article takes up this challenge. It offers the first detailed analysis of the modal fine‐structure of Hegel's natural kind essentialism and shows how Hegel's position, thus understood, provides the details needed to complete the explanation‐based argument.     

Moral Responsibility: Justifying Strawson and the Excuse of Peculiarly Unfortunate Formative Circumstances

P.F. Strawson’s theory of moral responsibility remains eminently influential. However, moral philosophers such as G. Watson and T.M. Scanlon have called into question it explanatory basis, which grounds moral responsibility in human nature and interpersonal relationships. They demand a deeper normative explanation for when it is appropriate to modify or mollify the reactive attitudes. In this paper, following A. Sneddon, I argue that the best interpretation of Strawson is an externalistic one which construes moral responsibility as an interpersonal social competence, as this approach uniquely satisfies Strawson’s demand that we justify the reactive attitudes from within the participant perspective. I then show that this is the only interpretation capable of preserving Strawson’s well-known excuse of being peculiarly unfortunate in one’s formative circumstances.     

The Argument for Subject Body Dualism from Transtemporal Identity Defended

In my argument for subject body dualism criticized by Ludwig I use the locution of a genuine and factual difference between two possibilities. Ludwig distinguishes three interpretations of this locution. According to his analysis the argument does not go through on any of these interpretations. In my response I agree that the argument is unsuccessful if ‘factual difference’ is understood in the first way. The second reading—according to a plausible understanding—cannot be used for the argument either. The discussion of this reading raises fundamental issues about different notions of propositional content. I disagree with Ludwig's diagnosis with respect to the third reading. Contrary to Ludwig's claim, there is no modal error involved if ‘factual difference’ is understood in the third way. Ludwig's objection to the argument according to its third reading can be answered by pointing out that every individual has its identity conditions necessarily. ¹ At this point fundamental and general metaphysical issues (concerning the link between identity conditions and the nature of ontological categories and between transworld and transtemporal identity) prove relevant. Finally, I make more explicit how ‘factual difference’ should be understood in the context of the argument (this is a fourth reading not considered by Ludwig) and explain how this reading strengthens the argument (compared to the third reading) by weakening its central premise. I conclude that Ludwig's attempt at undermining the argument from transtemporal identity for subject body dualism is unsuccessful.     

Proving quadratic reciprocity: explanation,disagreement, transparency and depth

Gauss’s quadratic reciprocity theorem is among the most important results in the history of number theory. It’s also among the most mysterious: since its discovery in the late eighteenth century, mathematicians have regarded reciprocity as a deeply surprising fact in need of explanation. Intriguingly, though, there’s little agreement on how the theorem is best explained. Two quite different kinds of proof are most often praised as explanatory: an elementary argument that gives the theorem an intuitive geometric interpretation, due to Gauss and Eisenstein, and a sophisticated proof using algebraic number theory, due to Hilbert. Philosophers have yet to look carefully at such explanatory disagreements in mathematics. I do so here. According to the view I defend, there are two important explanatory virtues—depth and transparency—which different proofs (and other potential explanations) possess to different degrees. Although not mutually exclusive in principle, the packages of features associated with the two stand in some tension with one another, so that very deep explanations are rarely transparent, and vice versa. After developing the theory of depth and transparency and applying it to the case of quadratic reciprocity, I draw some morals about the nature of mathematical explanation.