They are not following dharma who resort to violence to achieve their purpose. But those who lead others through nonviolent means, knowing right and wrong, may be called guardians of the dharma. – Buddha

The limitation of riots, moral questions aside, is that they cannot win and their participants know it. Hence, rioting is not revolutionary but reactionary because it invites defeat. It involves an emotional catharsis, but it must be followed by a sense of futility. – Martin Luther King, Jr.

The moment a man claims a right to control the will of a fellow being by physical force, he is at heart a slaveholder. – Henry C. Wright, The Liberator, 7 April 1837