I just watched Jerry Seinfeld's Netflix special, and he summed up supporting a sporting team/the concept of players switching sporting teams/trade week, perfectly.
"This whole concept of "the team", "your team, "my team", "that's our team!" - I mean, really? Who are these guys, where are they from? They're not from around here, they're just paid to wear those clothes. The uniform is the only constant in the sport. The guys are moving around, different teams, teams are moving from different towns. We're really just rooting for our clothes, to defeat the clothes from the team of the other city. That's what sports is. We're rooting for laundry, and nothing else! I always find it weird how upset we get when a guy leaves your team, and then he plays against your team. "Different shirt! I hate this guy! I CAN'T BELIEVE HE'S WEARING THAT SHIRT!" Meantime, everyone you see everyday is wearing a different shirt. You don't get upset with them for some reason, I dunno."
Hahaha