Where can large numbers of menfolk gather nowadays to celebrate their tribal allegiances and be hostile to another group, in order to let off steam and burn excess testosterone? This is an instinctive, basic bio-social need of males. Modern society is so emasculated, passive, risk-reduced and feminised that there are fewer and fewer opportunities for discharging collective and individual aggression safely. If that need is not met and sublimated in a relatively civilised theatre, it is certain to be forced out somewhere more damaging to society or individuals.
It certainly ain't Premier League Football.