Have you ever been involved with moderating even a small subreddit or Discord server? I'm on a server with one moderator and it routinely gets spammed while the guy is asleep.
> can't people just unfollow or block others whose opinions they don't want to see?
How do I block people BEFORE seeing the opinions I don't want to see? Trolls can roll up a new account for every single post they make, if they want to.
> there is no obligation to refute bullshit to begin with.
No, but if you're neither blocking nor refuting it, then your community is going to quickly become majority bullshit.