The issue is that true moderation needs to edit/delete/block/ban people who are *not* just trolling, *not* prima facie wrong, *not* obviously crazy, but whose presence is not conducive to meaningful discussion. Most rules statements and codes-of-conduct have trouble with that.
These may be separate issues. Each conversation is like a dance, and some folks don't see what the current dance needs, especially when their world view is totalitarian. Curating a conversation is different from excluding people from a platform, or guarding one's reputation.