> I definitely see the benefit in saying that certain topics are out of scope for a given community. But saying which ideas are acceptable and which are not sou

> I definitely see the benefit in saying that certain topics are out of scope for a given community. But saying which ideas are acceptable and which are not sounds like codifying the dominance of an official viewpoint. Yeah, exactly. But any anthropologist or sociologist will tell you that any social group works exactly that way, it's an inevitable reality of being social humans. The trick to support freedom of expression isn't forcing all possible communication forums to accept all possible topics and ideas; it's to create cross-pollination groups where some ideas that are taboo in other forums can be discussed in an adequate context. University used to be such a forum intended for cross-pollination and having a different set of taboos than the mainstream society, before it was hijacked by the dynamics of social networks.