I wasn't raised in a sports family, so those people look like tools and masochists to me. If you change one player, coach or trainer, it's a different team even if the essence remains temporarily. Teams are sold, move to other cities, and are renamed and people get that. Why is the rest so hard to grasp? Why do people hold a grudge against "their" teams rivals or against a team that shares the name and location of a team that beat the team that shared the name and location of their team twenty years ago?
Tribalism run rampant.
Watching sports is a fun form of entertainment. We see great feats of athleticism and it's hugely rewarding to root for and see an underdog win. I've seen sports bring out the best and the worst in players and fans, but I've never once seen a single sports hero.
If a movie star gets exposed as a drunk, drug addict, wifebeater, dog fighter, or communist, we quit supporting them through refusing to pay to see their films and they become obsolete. If a director puts out several movies in a row that bomb, we quit going to see their next one.
Professional athletes are some of the highest paid people in the world for doing something they enjoy with relatively little prior experience or training. They get paid to play. Not to win. Not to perform, to play. We, the fans, pay to see them play, and we pay to advertise for them by buying clothing, collectibles, autographs, household goods etc. with their ugly logos plastered all over them, even if they are the worst team in the league year after year. That isn't fandom. It's marketing and being a tool.
Don't even get me started on Go Fast, Turn Left NASCAR.
If your team sucks, pick another or just enjoy the sport for what it is: entertainment. You owe no professional sports team anything until they start paying you. Additionally, you owe other sports fans nothing.
If you want to support a college or high school team because the school's athletic department adds so much to the school's academics or finances, have at it.
Now that you've been deprogrammed, feel free to go outside and play with yourself.