  One reason for this is that much of the philosophical discussion focuses on the implications of the claim that much moral disagreement is radical, rather than on the truth of that claim. Another is that some arguments merely appeal to the possibility of radical moral disagreement and are consistent with thinking that all actual disputes involve some shortcoming. (See e.g., Tolhurst 1987, and Wright 1992 and 1996. See also the references to antirealists who use thought experiments of the type considered in section  5.)[3] That approach raises methodological questions of its own, of course, especially if one is not willing to extend one’s antirealism to all other domains. For then one must explain how one can establish that disagreements of the pertinent kind are possible in ethics but not in the other domains. The role empirical evidence might have in that context is a complex issue.