I think it's just you. Because the overriding and defining characteristic of tribalism is loyalty to the tribe; that's the only "responsibility" that tribalism demands. I think that you think that tribalism requires someone to play an active role in advancing the "goals" of the tribe, which is wrong. Tribalism, for lack of a better way to put it, is basically caffeine-free, diet nationalism. That's why (usually) it's perfectly okay for the consumption of sports-as-entertainment; it isn't (usually) until sports becomes SERIOUS BUSINESS~! that the tribalism of sports becomes problematic. And (to bring this tangent back around to the thread topic), from my point of view, one of the stepping stones along the path to tribalism in sports becoming problematic is when you're okay with a team trading a player, but not okay with the player asking to be traded.
I am also a military brat, whose military career was not cut short. I, too, have lived in different countries around the world, with different cultures and different economic systems. That background and perspective is exactly why I look at sports the way that I do.