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The others are just shouted down and may as well go homeI'm not sure that's true at all, lots of fringe views gain traction on Twitter. I'd imagine more of them still are moderated out of existence.
> So this is the key tension. Outgroups get criticism of themselves every-bloody-where
Yes, and by being a digital town square, Twitter, or any similar platform, would become part of everywhere, with the same consequences for outgroups.
> provide an opening for an outgroup to issue its own civilly-expressed criticism
I agree that outgroups should have this opportunity, but it must be applied to all the outgroups, including those who have a mutual loathing for each other, and those whom we loathe ourselves. Fairness dictates we shouldn't play favourites, in the same vein that the ACLU defended the a Nazi group's right to march through Skokie.
If an outgroup wants a private, safe space to express themselves, that place cannot also purport to be a public square of free expression. It's one or the other.