I think there have been ideas in every society that have been taboo and not allowed to be shared. For example, in Germany nobody is allowed to speak positively about the Nazis. This is ultimately a subjective line that is drawn by the people in power and by social forces. These platforms are just enforcing their own subjective line on bigoted viewpoints. It only seems to be negative against conservatives in most cases so personally I think it’s fine, since those bigoted viewpoints tend to come mostly from conservatives.