I gotta say, from experience growing up around Chicago, that banning a kid from ever coming back to something is not the cure to a problem; the kid becomes vindictive, and may very well end up joining a street gang (now he's become more of a problem than he was).
Just recently, I've become an Assistant Scoutmaster of a troop out here in Peoria, Il, while attending Bradley University; they are a great bunch of kids, but not without their disputes, of course. On a campout we went on last weekend, problems ranged from kicking each other while hiking in a straight line, tapping each other w