Shafer-Landau and Moral Realism [Review Essay: Russ Shafer-Landau, Moral Realism: A Defence

In 1903 G.E. Moore celebrated a robust nonnaturalistic form of moral realism with the publication of his Principia Ethica. Subsequent years have witnessed the development and refinement of a number of views motivated at least in part by a deep resistance to the metaphysical and epistemological commitments of nonnaturalism. Over time, Moore’s view arguably has become the position of last resort for philosophers working in metaethics. Exactly one hundred years later, analytic metaethics has come full circle with the publication of Russ Shafer-Landau’s Moral Realism: A Defence. Shafer-Landau confidently elaborates and defends a form of nonnaturalism about moral facts and properties, and conjoins his moral metaphysics with an anti-Humean theory of motivation, motivational externalism, reasons externalism, moral rationalism, and a hybrid of selfevident justification and reliabilism in moral epistemology. Needless to say, Shafer-Landau’s book is highly ambitious with respect to both the number of controversial theses it tries to defend as well as the antecedent skepticism it attempts to overcome. Regardless of whether its arguments are ultimately successful, Moral Realism deserves to be taken very seriously by anyone interested in metaethics, moral psychology, and the philosophy of action. In what follows, I will consider all five parts of Moral Realism in order, offering a brief summary of some of the main ideas in each section as well as raising a few objections (although without being able, in the space available, to do justice to all or even the majority of the interesting arguments with which the book is filled).