What's not fine is that sooner or later your child will start to model your behavior. If you need to be restrained from assaulting someone at a football game, the real question is, where else does that extreme behavior show up in your life?
I'm not trying to be a dick, but seriously, if you can't watch the game without getting to that point, you shouldn't watch the games at all. And you should strongly consider therapy to deal with the underlying issues you are trying to manage.