What is the significance of empirical moral psychology for metaethics? In this article we take up Michael Ruse’s evolutionary debunking argument against moral realism and reassess it in the context of the empirical state of the art. Ruse’s argument depends on the phenomenological presumption that people generally experience morality as objective. We demonstrate how recent experimental findings challenge this widely-shared armchair presumption and conclude that Ruse’s argument fails. We situate this finding in the recent debate about Carnapian explication and argue (...) that it illustrates the necessary role that empirical moral psychology plays in explication preparation. Moral psychology sets boundaries for reasonable desiderata in metaethics and, therefore, it is necessary for metaethics. (shrink)

SPECIAL ISSUE ON DISAGREEMENTS: The fact of moral disagreement is often raised as a problem for moral realism. The idea is that disagreement amongst people or communities on moral issues is to be taken as evidence that there are no objective moral facts. While the fact of ‘folk’ moral disagreement has been of interest, the fact of expert moral disagreement, that is, widespread and longstanding disagreement amongst expert moral philosophers, is even more compelling. In this paper, I present three arguments (...) against the anti-realist explanation for widespread and longstanding disagreement amongst expert moral philosophers. Each argument shows the argument from expert disagreement for moral anti-realism, that is, denial of morality’s objectivity, to be in one way or another self-undermining. I conclude that widespread and longstanding disagreement amongst expert moral philosophers is not a problem for moral realism. (shrink)

Moral relativism is an important topic in metaethics. It is also widely discussed outside philosophy (for example, by political and religious leaders), and it is controversial among philosophers and nonphilosophers alike. This is perhaps not surprising in view of recent evidence that people's intuitions about moral relativism vary widely. Though many philosophers are quite critical of moral relativism, there are several contemporary philosophers who defend forms of it. These include such prominent figures as Gilbert Harman, Jesse J. Prinz, J. David (...) Velleman and David B. Wong. The term ‘moral relativism’ is understood in a variety of ways. Most often it is associated with an empirical thesis that there are deep and widespread moral disagreements and a metaethical thesis that the truth or justification of moral judgments is not absolute, but relative to the moral standard of some person or group of persons. Sometimes ‘moral relativism’ is connected with a normative position about how we ought to think about or act towards those with whom we morally disagree, most commonly that we should tolerate them. (shrink)

Evolutionary debunking arguments draw on claims about the biological origins of our moral beliefs to undermine moral realism. In this paper, I argue that moral disagreement gives us reason to doubt the evolutionary explanations of moral judgment on which such arguments rely. The extent of cross-cultural and historical moral diversity suggests that evolution can’t explain the content of moral norms. Nor can it explain the capacity to make moral judgment in the way the debunker requires: empirical studies of folk moral (...) judgments show that they lack the kind of objectivity debunkers point to as an evolutionary contribution to our capacity for moral judgment. Thus, the empirical premise of debunking arguments lacks empirical support. (shrink)

Moral disagreement is often thought to be of great metaethical significance for moral realists. I explore what remains of that significance when we look at moral disagreement through the lens of a combination of two influential and independently plausible hypotheses about moral language. The Morality-As-Cooperation (MAC) hypothesis says that our capacity for and use of moral language is an adaptation to increase mutualistic cooperation. The Concepts-As-Tools (CAT) hypothesis says that we often engage in disputes about language use and that many (...) apparent moral disagreements are linguistic disagreements in disguise. The combined MAC-CAT view that I explore suggests that we frequently engage in linguistic disputes to find optimal means for mutualistic cooperation. I show that this perspective weakens sceptical claims based on moral disagreements, that is offers a novel way for moral realists to explain the apparent genuineness of moral disagreements without the need to accept theses borrowed from non-cognitivism. (shrink)