https://anildash.com/2011/07/20/if_your_websites_full_of_assholes_its_your_fault-2/
He's right, the problem is that it doesn't scale well. We could police the Core pretty easily, but the big sights would have to have an army of moderators to do it right. Enforcement by algorithm is a poor replacement. This is why all the big social sites vector to shit in the long run.