Just because you don't have an appreciation for something doesn't mean it's wrong or dumb.
As for football, specifically - there's a play, then a break when you get to either celebrate or bitch about the refs' bad call or run to pee (and risk not seeing the next play!)...repeat cycle while drinking a cold beer and eating chips with salsa/guac or other finger food of choice.
Competition is fun, action in sports is fun, supporting a team is fun... It's just meant to be fun as far as I'm concerned.
As for riots...they were probably drunk when it started. :rolli: