Some moral realists argue that the disagreements, widespread as they are, do not go very deep—that to a significant degree moral disagreements play out against the background of shared fundamental principles with the differences of opinion regularly being traceable to disagreements about the nonmoral facts that matter in light of the moral principles. On their view, the explanation of moral disagreements will be of a piece with whatever turns out to be a good explanation of the various nonmoral disagreements people find themselves in.
Other moral realists, though, see the disagreements as sometimes fundamental. On their view, while moral disagreements might in some cases be traceable to disagreements about nonmoral matters of fact, this will not always be true. Still, they deny the anti-realist's contention that the disagreements that remain are well explained by noncognitivism or by an error theory Instead, they regularly offer some other explanation of the disagreements. They point out, for example, that many of the disagreements can be traced to the distorting effects of the emotions, attitudes, and interests that are inevitably bound up with moral issues. Or they argue that what appear to be disagreements are really cases in which the people are talking past each other, each making claims that might well be true once the claims are properly understood (Harman 1975, Wong 1984). And they often combine these explanatory strategies holding that the full range of moral disagreements are well explained by some balanced appeal to all of the considerations just mentioned, treating some disagreements as not fundamentally moral, others as a reflection of the distorting effects of emotion and interest, and still others as being due to insufficiently subtle understandings of what people are actually claiming. If some combination of these explanations works, then the moral realist is on firm ground in holding that the existence of moral disagreements, such as they are, is not an argument against moral realism. Of course, if no such explanation works, then an appeal either to noncognitivism or an error theory (i.e. to some form of anti-realism) may be the best alternative.
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