Since a system of liberty would encourage the voluntary and discourage the criminal, and would remove the only legitimated channel for crime and aggression, we could expect that a free society would indeed suffer less from violent crime and aggression than we do now, though there is no warrant for assuming that they would disappear completely. That is not utopianism, but a common-sense implication of the change in what is considered socially legitimate, and in the reward-and-penalty structure in society.