The point was making before I accidentially hit "post", was that HBO's Real Sports had a segment in its recent episode about fan violence at sporting events. One of the interviews in the piece featured the mother and sister of San Francisco Giants fan Brian Stow, who may know was beaten nearly to death by supposed Dodger fans at a Giants-Dodgers game in Los Angeles last year. Another interview featured an Oakland Raiders fan and his sister, who themselves were targets of 49ers fans at preseason game last year between the two teams at Candlestick Park. Because of that and several other incidents occuring at the same game, the 49ers suspended their annual preseason game with the Raiders for the time being, and have majorly beefed-up security in and around the stadium, including suspending tailgating activities at least a hour before each game.
As to the Patriots-Ravens game, I didn't watch the full game, but I saw highlights later last night, and Bill Belichick was very angry because the replacement refs called was really a missed field goal good. From what I saw of the replay, the ball veered-off to the right just as it was approaching the crossbar. The intial camera angle may have showed otherwise, but when they showed a zoomed-in angle, the ball was slightly-above and to the right of the crossbar. Belichick, after the conclusion of the game, ran up to one of the replacement officials and grabbed his arm...he's certainly to be fined, even if he was somewhat-justified in his actions.