There's a pretty big difference between wiki-first sites and discussion-first sites, though.
Exactly. You can't, imo, usefully abstract login/anonymity from the context of what the site is. Is it a chatty forum, like hn? A wiki has somewhat objective or predefined goals. That legibility helps frame things and flame wars need to resolve somehow.
When a discussion thread on a forum erupts into flamewar, we just move on. No resolution is necessary except perhaps preventing the next flame war.
The negative contributions seem to catalyze an outsized positive response.
Reflects the experience of Wikipedia as well.
Apparently crowds know how to deal with themselves.