So let me get this right:
Arguing about whether children should be locked in cages is like arguing about sports teams?
Arguing about whether people of colour are humans or vermin is like arguing about sports teams?
Arguing about whether women are entitled to a vote, or to own property, or to equal pay for work of equal value, is like argguing about sports teams?
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I'd say that you are articulating a very distinct political slant, and that slant is that nothing really matters, there is no absolute truth or morality, everything is about tribalism.
If you look around more carefully, you'll notice that a great many people argue about politics in a way entirely different than they argue about sports teams.
While I agree that there are a lot of people who share this point of view, and really all they care about is their tribe and not the thing they're arguing for or against.. I am not one of those people.
And let me tell you, when I disagree with that viewpoint, I am absolutely NOT arguing about it the same way I'd argue whether Eddy Merckx or Marianne Vos is the greatest cyclist of all time.