Earlier quoted context omitted.
Easy: stop moderating. Just allow everything.
"Crime sure is hard to stop." "Well, just make everything legal."
The issue here is more like defining what crime is, though, not stopping it. Stopping stuff on FB is easy. Figuring out what to stop, is hard. Figuring out if a disputed case should have been stopped is hard. For the 'real world' we have parliaments and courts, but there's FB has only the equivalent of police, not the other parts of the system. It is, in effect, a police state.