To oppose government is to oppose institutional violence. The characteristic feature of its activities is to compel people through the application or the threat of force to behave otherwise than they would like to behave. When government is perceived thus, opposition to violence implies libertarianism. Libertarian Party members sign a pledge of nonviolence. I hereby certify that I do not believe in or advocate the initiation of force as a means of achieving political or social goals.
Libertarians always oppose initiation of violence.
Although bees can sting they are considered friendly since they are harmless when left alone. So too with libertarians. The only time violence is excused within libertarianism is in defense against violence initiated by others. Libertarians value restitution to the victim above punishment of the criminal. The end does not justify the means.