A key objection to naturalistic versions of moral realism is that the (meta)semantics to which they are committed yields incorrect semantic verdicts about so-called Moral Twin Earth cases. Recently, it has been proposed that the Moral Twin Earth challenge can be answered by adopting a neo-Aristotelian semantics for moral expressions. In this paper, I argue that this proposal fails. First, however attractive the central claims of neo-Aristotelianism are, they do not for us have the status of analytic constraints on the (...) use of ethical expressions, as they must if they are to block Moral Twin Earth counterexamples. Second, even when the neo-Aristotelian’s claims are taken as non-negotiable analytic constraints, the semantics faces a dilemma: if characteristic human functioning is understood in an ethically neutral way, the semantics yields an incorrect intension for ‘good human.’ If human functioning is understood in an ethically partisan way, the semantics fails to avoid problematic Moral Twin Earth counterexamples. (shrink)

According to the eligibility theory of meaning, often attributed to David Lewis, the referent of a predicate is the property that best balances the twin constraints of charity and eligibility, where eligibility is a function of metaphysical naturalness. This sort of metasemantics, which is motivated by its ability to resolve problems of indeterminacy and secure shared reference between disputing parties, can be somewhat friendly towards revisionary theories, since highly natural properties can act as “reference magnets,” securing our reference despite some (...) mismatch with usage. In this paper, I apply these considerations to normative ethics and argue that the theory of rule utilitarianism achieves a high balance of charity and eligibility. I proceed by comparing rule utilitarianism to two of its well-known rivals, act utilitarianism and Rossian pluralism. I show how the former achieves a high degree of eligibility but only at a significant cost of charity, while the latter does the opposite, fitting very nicely with our considered judgments but at the price of very low eligibility. Rule utilitarianism, on the other hand, strikes a good balance between these extremes; it assigns to our core moral term a relatively natural property without doing too much damage to our moral convictions. Thus, rule utilitarianism should be regarded as a promising moral theory by any philosopher who takes seriously considerations of eligibility and naturalness. (shrink)

The Moral Twin Earth challenge to ethical naturalism threatens to undermine an otherwise promising metaethical view by showing that typical, naturalist-friendly theories of reference determination predict diverging reference in Twin Earth scenarios, making it difficult to account for substantive moral disagreement. Several theorists have recently invoked David Lewis’s doctrine of reference magnetism as a solution, claiming that a highly elite moral property—a moral “joint in nature”—could secure shared reference between ourselves and our twins on Twin Earth, despite our diverging usages (...) of moral terms. This paper argues that this move has significant methodological implications: namely, it entails that a certain sort of simplicity is truth-conducive. Consequently, when applied to moral theories, this gives certain views, specifically monist ones like utilitarianism and contractualism, an advantage over their more complicated rivals, forms of pluralism and particularism. Thus, ethical naturalists cannot invoke reference magnetism without a substantial impact on first-order theorizing. (shrink)

It is often claimed that realism about normativity entails that it is difficult for us to know anything about it. I refine this thought by characterizing realism as a thesis which is committed to explaining a semantic thesis about possible uses of normative language: that normative terms like ‘ought’ are semantically stable, in the sense that the term refers to the same property even if it is used differently. There are independent arguments which show that a realist view, if it (...) is plausible, should entail semantic stability for ‘ought’. In this paper I argue that, if the realist succeeds in explaining semantic stability, the realist view implies that normative beliefs will be at risk of being false, and hence not knowledge. Central to this argument is a phenomenon I call meta-semantic risk. I argue that the phenomenon of meta-semantic risk gives rise to a significant dose of normative skepticism for the realist, but it does not entail wholesale skepticism, since the epistemic threats are only contingent, and threatens only precise normative beliefs. I close by sketching two arguments that may show that even this limited form of skepticism counts significantly against the realist view. (shrink)