People getting riled up about soccer as a way to blow off steam and experience their tribalism is vastly superior to what we have in the USA -- a political environment that people treat like battling football clubs complete with lawless hooligans.
When a soccer team wins they don't get to ascend to power and leverage the state against their enemies.
Well typically a case is referred to them by law enforcement or a criminal complaint, then they review the evidence and decide whether or not to go to trial.
It's much rarer for a DA to say they want to find crimes a particular person committed and then direct others to go find evidence for whatever they can find evidence for.
I don't know how much of this tribalism is confined to the stadium. Personal experience makes me feel like there is a big overlap between Ultras and actual nationalists, but I'd like to see a study.