Behavior issues are always getting worse, but people are going to drink, too much. Ballgames are like a fisherman, when they hit the water, it's more of a birthright.
Which reminds me, my wife and I got on a plane early in the morning and a flight from Jacksonville was coming into B'ham. We were running late so we had to grab what seats were left. Turns out the last 2 seats were separate and the one seat everyone was avoiding was occupied by a roaring drunk and his wife. So I had to take what was left (never did the first come first serve thing again). Less than an hour later, in the air, he was still raising his hand with 20 dollar bills in it and the crew was still serving this obnoxious drunk alcohol.
Now, this dude is acting a straight fool and even with his wife's insistence, I think fearing for his health, was trying to keep him under control. One hour in, it was him or me. The last straw was this guy slapping the mag I was reading out of my hand. So I thought out of courtesy I would warn the stewardess, one more time, it would really be in the best interest of everyone if they find me another place to sit and quit serving him drinks when he was now blind drunk. The fact that I had my hand on the back of this nitwits head when I explained this may have done it, but who knows. So I sat in the back with the stewardesses and it was really very comfortable and most of all they quit serving this raging alcoholic drinks. I tried to make it clear to the help that the biggest problem for what happened was on them. He was drunk when he got to B'ham and they kept serving. They were young and just giving in.
Just to say, it doesn't have to happen at a football stadium, though I could tell the same stories the rest of the day. Feeding the beast always makes it worse, no matter where it is.