Con-reasons and the causal theory of action

A con-reason is a reason which plays a role in motivating and explaining an agent's behaviour, but which the agent takes to count against the course of action taken. Most accounts of motivating reasons in the philosophy of action do not allow such things to exist. In this essay, I pursue two aims. First, I argue that, whatever metaphysical story we tell about the relation between motivating reasons and action, con-reasons need to be acknowledged, as they play an explanatory role not played by pro-reasons (the reason the agent takes to count in favour of the action taken). Second, I respond to an argument recently developed by David-Hillel Ruben to the effect that a causal theory of action – still known as ‘the standard story’ – cannot account for con-reasons. His argument attempts to show that a fundamental principle of the causal theory cannot be reconciled with the role con-reasons play in a certain kind of imagined case. I first argue that a causal theorist is not, in fact, committed to the problematic principle; this argument has an added benefit, since the principle has been taken by many to show that the causal theory generates a puzzle about the possibility of weak-willed action. I then argue that a causal theorist has good reason to reject the possibility of Ruben's imagined cases. If successful, my arguments make clearer the commitments of the causal theory and show that it can accommodate con-reasons in the way I think they ought to be accommodated.