" The first lesson that tragedy teaches (and that morality plays miss) is that all violence is an attempt to achieve justice, or what the violent person perceives as justice, for himself or for whomever it is on whose behalf he is being violent [...] Thus, the attempt to achieve and maintain justice, or to undo or prevent injustice, is the one and only universal cause of violence. "

― James Gilligan , Violence: Reflections on a National Epidemic