I think the reason he finds it Very Not Cool is that compelling Eugene to reverse the downvotes is basically trying to blackmail him into admitting that he was wrong, which he presumably doesn’t believe, so you would be forcing him into lying (as well as renouncing beliefs that he presumably holds relatively strongly). I agree with the grandparent that this would be a bad thing to do.
I think the reason he finds it Very Not Cool is that compelling Eugene to reverse the downvotes is basically trying to blackmail him into admitting that he was wrong, which he presumably doesn’t believe, so you would be forcing him into lying (as well as renouncing beliefs that he presumably holds relatively strongly). I agree with the grandparent that this would be a bad thing to do.