I don't think that follows. Self-censorship via training is more effective than police enforcement since, again, the police can't be everywhere. If you can make the masses afraid of crossing certain lines, so they posit taboos that limit their thinking, you've trained people to follow the law without the need for totalitarian enforcement.

These mass hallucinations amount to the instilling of a conscience, of the fear of violating certain taboos. We'd feel guilty were we to invade someone else's house, as though we didn't "own" that property, because we've been domesticated since we were children. It's a question of mental training, the way farmers train livestock (although that has a genetic component).