The point was that not selling beer would reduce the crowds by 30,000. That doesn't happen at college games.
This used to be a huge problem with the Pats at the old shithole Foxborough Stadium before the Krafts took over. My grandfather has had season tickets since the 60's and he's told me about how bad it used to be and I remember some of it myself from when I started going to games when I was 7. The best way to improve people being total assholes at games is to have a strict security policy: your seats are complained about mildly once you get a warning, second time or severe first offense and they are revoked. I even heard of a guy onetime that was talking shit with a state trooper outside the stadium and the guy's name was taken and 3 days later a family that had tickets for 30+ years had them taken away. It's still a football game, some people are pretty crude sometimes but overall I think it's made the overall environment much much better than it was back in the early 90's. Somebody mentioned it a few pages back and I'll say it again since I also think it's such a good point. If in-stadium alcohol sales are banned it will just result in people sneaking them in and getting COMPLETELY tanked before the game tailgating. Edit: The Jets probably do have a policy something like this but I've never been to Giants Stadium so I don't know. If in-game rowdiness by fans still is a problem though it clearly isn't being enforced strictly.