Peace through violence has merit. Youre too young to see that yet. Ask yourself where the world would be today if the world just "peacefully" tried to stop Hitler.
Yes, like taking out a tyrant who murders his own people is a good form of peace thru violence. But bin Ladens kind, murder thousands of innocents just living normal lives and not bothering anyone, is senseless and tragic...
Both cases only prove that sometimes peace through violence is helpful. I want to go on record, though, that most of the time peace is the right way.