Pick any "we should oppress this thing that other people want/like/are" and there are people who miraculously realize that actually, there's a reason people want/like/are that thing once it happens to them.
I think it starts from some combination of factors like fear of the unknown, superiority complexes, downright stupidity, etc., which are only un-blinded when it smacks you in the face.
It works I’m reverse as well. The owner of a socialist magazine just recently fired most of his staff for trying to unionize. He wrote a bunch of articles purporting to support all these ideals but the moment those ideals threatened his power he shut it down.
