The most important element of a free society, where individual rights are held in the highest esteem, is the rejection of the initiation of violence. All initiation of force is a violation of someone else's rights, whether initiated by an individual or the state, for the benefit of an individual or group of individuals, even if it's supposed to be for the benefit of another individual or group of individuals. Legitimate use of violence can only be that which is required in self-defense.

Freedom Under Siege (1987).