That's true as far as Professional hockey and probably college hockey. However, our high school hockey games had some of the worst fights both on the ice as well as in the stands. Worst (or best) were out in the parking lots. I guess it was the result of too much brandy and beer. Oh yeah, plus many of the games took place on Friday and Saturday nights.
There were usually more cops at hockey games than any other of our sports. Just a bit more US trivia information!
Brian