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But, even a moral realist should not have 100% confidence that he/she is correct with respect to what is objectively right to do. The fact that 100% of humanity is morally appalled with an action should at a minimum raise a red flag that the action may not be morally correct.
Similarly, "feeling icky" about something can be a moral intuition that is in disagreement with the course of action dictated by one's reasoned moral position. it seems to me that "feeling icky" about something is a good reason for a moral realist to reexamine the line of reasoning that led him/her to believe that course of action was morally correct in the first place.
It seems to me that it is folly for a moral realist to ignore his/her own moral intuitions or the moral intuitions of others. Moral realism is about believing that there are objective moral truths. But a person with 100% confidence that he/she knows what those truths are and is unwilling to reconsider them is not just a moral realist, he/she is also a fanatic.