Another angle on this (and I seem to remember commenting on the forum on this before).
There is another factor which disposes people towards avid, and, yes, rabid, support of their chosen teams: money.
In a lot of cities, such as Gainesville here, that are home to a major university with a major sports program, the various university teams, especially football and basketball, bring in large numbers of fans to Gainesville, especially in the fall, who while they are here spend good amounts of cash on lodging, food, gas, souvenirs, etc.
That is, they are a boost to the local economy when they are here, and they are here thanks to the sports teams.
Here's a good write-up on this phenomenon in the UF student newspaper from a couple of years ago:
https://www.alligator.org/article/2022/09/selling-in-the-swamp-gators-football-fuels-gainesville-gameday-micro-economy Some noteworthy observations from it:
"Beneath all the noise is a thriving gameday micro-economy, ranging from some of the most popular restaurants in Gainesville down to every booth stationed along West University Avenue."
“When the Gators win, it affects business in a positive way because people are more inclined to come out to the bar, have a few drinks to celebrate.”
"While downtown Gainesville quiets down leading up to kickoff, Midtown and its surrounding area ramp up. The newly reopened Swamp Restaurant floods with patrons eager for a gator-themed party. Lines of orange and blue form as soon as the restaurant’s doors are opened."
"As fans dash to secure a spot at popular bars and restaurants, they often stop at little booths hosted by Alachua County locals along the way."It's probably still true that the majority of the truly rabid-and-hysterical fans are super-devoted to their teams for various deep-seated psychological reasons. And some of those reasons ought to require a self-examination to see if they are directing one's behavior in extreme ways, if that applies to individuals.
But for others, who make some or a lot of their incomes on gameday, it's more a matter of cash than passion.