At least that is how they started and it wasn't News. We only make News of violence it seams so now it is News. I was listening to the World Service last night where they were interviewing some protesters who were saying things like 'this could be a beautiful World, it is too full of misery now, we must change it' http://www.guardian.co.uk/world/2013/jun/18/brazil-protests-erupt-huge-scale
You'd better find some "Cohen" in the crowd should this turn ugly, what am I saying....you probebly already got a signed declaration lol ....
They are protesting against public transportation fee increase, insufficient public services and a football tax all very good reasons to protest but none good one to start burning stuff .