Words can be awful; ideologies can be evil. But violence breaks a society in half. The Nazis could never have risen without the specter of violent Reds on the loose to fight against. The Confederacy could never have gained steam so quickly without the abolitionist vigilantism of John Brown. Violence — even in the name of wiping away evil ideologies — tends to breed more violence, unless it is a legitimate last resort.
What’s more, the initiator of violence in the streets tends to offend the sensibilities of those who oppose violence in a civilized society. He thereby creates sympathy for those who defend themselves — even if those who defend themselves are disgusting cretins. That’s because most people in a civilized society agree with Max Weber’s essential dictum that the state’s existence rests on its monopoly on the legitimate use of physical force. Whoever violates that covenant destroys the state.