Of all the reasons to kill someone, the result of a ballgame has got to be one of the dumbest and most pointless ones, right up there with the other guy calling his invisible friend by the wrong name.
Are we just hardwired for tribalism? I mean, everywhere you look, people readily identify themselves with a tribe, and go to war with the Others. Most of the time, that tribal warfare is stylized (like football) or virtual (like Mac-vs.-PC flamefests online), but every once in a while, someone gets so caught up in their tribal identity that blowing away someone with a shotgun over their allegiance to a college team seems like a necessary course of action.
I swear, sometimes I can’t decide whether our species is too smart or too dumb for its own good. I mean, we have particle colliders, and we send robots to Mars, but there’s a significant subset of our species that will revert to Neolithic skull-bashing on the most flimsy of pretexts.