The existence of moral disagreement, standing alone, is not enough to show moral realism is false. After all, scientific disagreement doesn't show physical realism is false.
Further, I am confused by your portrayal of moral realists. Presumably, the reality of moral facts would show that people acting contrary to those facts were making a mistake, much like people who thought "Objects in motion will tend to come to a stop" were making a mistake. It seems strange to call correcting that mistake "ignoring everyone's actual scientific feelings." Likewise, if I am unknowingly doing wrong, and you can prove it, I would not view that correction as ignoring my moral feelings - I want to do right, not just think I am doing right.
In short, I think that the position you are labeling "moral realist" is just a very confused version of moral anti-realism. Moral realists can and should reject that idea that the mere existence at any particular moment of moral disagreement is useful evidence of whether there is one right answer. In other words, a distinction should be made between the existence of moral disagreement and the long-term persistence of moral disagreement.
The existence of moral disagreement, standing alone, is not enough to show moral realism is false.
I didn't say that it was. Rather I pointed out the difference between morality and Friendliness.
For an AI to be able to be Friendly towards everyone requires not moral realism, but "friendliness realism" - which is basically the idea that a single behavior of the AI can satisfy everyone. This is clearly false if "everyone" means "all intelligences including aliens, other AIs, etc." It may be true if we restrict ourselves to &...
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