Ukraine was totally going to end us all when Putin/Hillary hits the big red button. Any minute now.
Look, you can't lustrate the public square of idiots. Dumb shits are going to say dumb shit things and they're too dumb to realize they're going to get punished for it (even if they are) so they'll do it again. If you declare war on idiocy you instantly lose time for anything else, and you also plain lose. You can't outnumber idiots 3:1. Quite the reverse.
Ban, block, ignore, move on.
Anyone who retweets &c the idiocy reveals themselves to be brothers in idiocy. Ban, block, ignore, etc.
This is why you need a Pope. Whitelisted conversation. The Pope decides who can avoid idiots, and non-idiots can realize the Pope will de-list them if they do something stupid. Not even a speck of free speech. Result: quality communication.
Do not public square. Not even once.
If the Pope fucks up, one way or another, get a new Pope. Block, ban, ignore, impeach, whatever.
Which is why you need a hierarchy.
Which is why you need an explicit community.