Victory attained by violence is tantamount to a defeat, for it is momentary. – Gandhi

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.

And so, to the end of history, murder shall breed murder, always in the name of right and honor and peace, until the gods are tired of blood and create a race that can understand. – George Bernard Shaw, "Caesar and Cleopatra"