> The most successful societies have freedom, the rule of law, and allow violence only as a last necessity to restore freedom and the rule of law.

The ugly, uncomfortable part is that when a certain fraction of people decide violence is the answer, a tipping point is reached and that's what happens. Historically, people have reached that point en masse without a great deal of provocation. So for a society to remain successful--or to remain at all--it needs to prevent this tipping point from happening. Force alone can't do that.