Autonomy and radical evil: a Kantian challenge to constitutivism

Properly understood, Kant’s moral philosophy is incompatible with constitutivism. According to the constitutivist, being subject to the moral law cannot be a matter of free choice, and failure to comply with it is to be understood as a deficiency in one’s integrity as an intentional agent. I reconstruct Kant’s arguments to the conclusion that immorality, moral evil, consists in choosing to give one’s unity as an intentional agent supremacy over the moral law, and that one’s being subject to the moral law must be one’s own free choice. And I explain how Kant’s doctrine of radical evil, according to which we cannot be subject to the moral law without actually being morally evil, protects this conclusion from entailing the denial of the unconditionally binding character of moral principles, which character constitutivists correctly identify as the central concern of Kant’s – or any – moral philosophy.