You're missing the point. Plays and movies are poor analogies.So you wouldn't leave a Broadway play because "you're not emotionally involved in the outcome" but you'd leave a UConn football game that you actually are emotionally involved with. Now that's rational thinking. Look, if you have to leave for your kids emergency that's understandable. But a gridlocked parking lot is no excuse. Leaving early is indeed an insult to the players, the coaches and your own team loyalties. But it is a free country so knock yourself out.
I said I've left early if we're getting blown out. That's not an irrational position no matter you spin it. My time, is my time. I don't owe anyone on that field my time. If they are insulted, tough. Do better.