One Man Street Patrol
Some very good advice in the following video. It augments the Broken Window Theory.
Violence, like fire, can break out anywhere that a critical quantity of the necessary elements coincide. We don't always have control over our environment; that's why we keep our extinguishers handy. But, the best way to deal with the problem is to keep the necessary elements from coming together in the first place—when we can.
-fl