They themselves might have cared, but damn if I wear a purple shirt in Seattle folks are like Go Huskies to me, to the point where I think twice about putting it on or wearing it outside the house. I could give a damn about sports or nationalism, but lots of other idiots do.
Downvoted and reported, frankly. How can you do callously say something about this? You do realize sports fans are (for the most part) self aware of the inconsequence of a sports rivalry in the real world, right?
That is why we go to great lengths to civilize ourselves. Sports fanaticism is a fetal nationalism. Maybe we should challenge our hardwired programming, it does seem to offer a lot of control in our actions.