Doesn’t that also create a kind of immunity, though? If what I see is a cacophony of differing views, then I am unlikely to be influenced by any particular sock puppet account.

Whereas a community that tends towards groupthink might have a narrower range of views, but if those views begin to shift in a particular direction then it’s much harder for those who are disadvantaged by that shift to resist, because to do so requires violating the norms of groupthink.

I’m not sure which is better. My own preference is to tolerate a wide range of views in return for robust disagreement being the norm, but I can imagine some (most?) people preferring the opposite.