In a real public square, moderation is both official (the police, keeping the peace or enforcing authoritarian oppression, depending on where you are) and organ

In a real public square, moderation is both official (the police, keeping the peace or enforcing authoritarian oppression, depending on where you are) and organic (a loudmouth nazi sympathizer getting knocked out and nobody-having-seen-anything). Not that the IRL public square is immune to rule-breaking. In the heat of the moment, a mob can do horrendous things in a flash.