  The argument to the effect that moral disagreement generates problems for moral realists by committing them to the inaccessibility of moral facts is ultimately of an epistemological nature. It is thus congenial with the more general idea that disagreement sometimes raises skeptical worries by suggesting that our grounds for the contested beliefs are inadequate and that they thus fail to be adequately justified or amount to knowledge. And although that idea applies to other areas as well, it is often taken to have a special relevance to ethics, given the extent of the disagreement that occurs there.