These words from Dr. King are just as relevant today as they were when he wrote them:

In the guilt and confusion confronting our society, violence only adds to the chaos. It deepens the brutality of the oppressor and increases the bitterness of the oppressed. Violence is the antithesis of creativity and wholeness. It destroys community and makes brotherhood impossible.

The ultimate weakness of violence is that it is a descending spiral, begetting the very thing it seeks to destroy. Instead of diminishing evil, it multiplies it. Through violence you may murder the liar, but cannot murder the lie, nor establish the truth. Through violence you may murder the hater, but you do not murder hate. In fact, violence merely increases hate. So it goes. Returning violence for violence multiplies violence, adding deeper darkness to a night already devoid of stars. Darkness cannot drive out darkness: only light can do that. Hate cannot drive out hate: only love can do that.

Martin Luther King Jr.