  These considerations lead to the following worry. If it is a sociological fact that moral disagreements are generally more recalcitrant to resolution than disputes which do not involve differences about moral value — as I will assume for the sake of argument — what explains this fact? A possible explanation is that there is no fact of the matter about whether the practice in question is morally right. People agree or disagree in their moral attitudes, but there are no moral truths about which they can be mistaken. Hence, nothing about which they have conflicting attitudes is or can be a proper object of knowledge. In short, moral disagreements often resist resolution, however intelligent, informed, and respectful the disputants may be, because moral knowledge is impossible.