Devitt on Moral Realism

In this article the author criticizes Michael Devitt's Naturalistic Moral Realism, as well as that program in general. The author argues the following: moral explanations do not work; the fact that moral features supervene on the non-moral ones does not support the thesis of Realism; moral principles can not be tested like factual ones; Moral Realists Naturalists water down their thesis so much that it ceases to be a form of realism; there are no moral observations in any interesting sense.