Police in Montreal this week arrested more than 200 people after a protest against the World Trade Organization turned violent. About 400 activists demonstrated peacefully outside an informal meeting of about 25 international trade ministers, but splinter groups smashed store windows and vandalized luxury cars. These are legitimate targets, an organizer said. Protesters said they aimed to shut down the meeting and pressure corporations to do more to help impoverished countries. One activist, lawyer Marc Stamos, said the rioters were hurting their own cause. You cant protest against violence and poor treatment against one person, he said, and then go do it yourself.