One scenario that worries me:

100% of existing users block unpleasant posters. New user joins. New user sees hateful/ignorant comments with zero contradictions in replies. New user assumes many existing users are hateful/ignorant, when in reality it’s a small muted minority. New user leaves never to return.

Potential partial solution/community contribution:

Resilient users in excellent health (🧠) block no one, replying to lampoon jerks as necessary.