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What if a group demands that they not be subjected to unwelcome opinions? Seems to me that many people think this second one might be a-ok, provided it is for the right reasons.
Take HN for example. I would have thought hackers would be free-speech oriented, but apparently, in a group, they are just as good at punishing differences as high-school bullies. (It's human nature, I think. And it is visible in every other situation where the punished achieve some level of power over their former tormenters or the less popular among their own ranks.)