Why is violence better than nonviolence at stopping oppression ?

"Nonviolence is fine as long as it works," Malcolm X once said. Recently, Columbia University Press published an extraordinary scholarly book that proves how nonviolence works far better as a method for social change than violence. This breakthrough book demonstrates that Gandhi was right, that the method of nonviolent resistance as a way to social change usually leads to a more lasting peace while violence usually fails.

Violence is never good

What was the length to begin with?