The most recent riots in Paris that I read about were a result of police brutality and the obvious subsequent cover-up that followed.  Rioting may not be the best response, but when police investigate themselves and then back the claim of accidental rape with a police baton - so violent that it caused serious injuries to the victim's rectum - surely you can understand how frustrations can boil over.  Are non-immigrants in Paris subjected to random, brutal violence by the police, without any recourse?    Maybe Canada will treat its immigrant population like humans.