Kantian Naturalism

I offer a qualified defence of Kant's natural teleological argument, that is, his inference from the (un)naturalness of an act to its (im)morality. Though I reject many of Kant's conclusions, I think the form of argument he uses to support these conclusions is not as wrong-headed as it might at first appear. I consider and answer two objections: first, that the argument is inconsistent with Kant's moral rationalism; and second, that the argument is inconsistent with post-Kantian developments in science. I argue that both objections rest on a common mistake, namely, the assumption that the account of (human) nature on which Kant's argument relies is theoretical. On the contrary, the relevant account is practical: informed by science, but not determined by it. Once we appreciate the practical character of Kant's naturalism, we can see not only that Kant can be a naturalist and a rationalist, but contemporary Kantians can be as well.