It's a bit of a Chris Rock 'I take care of my kids' point to make, like. but again, it's understandable when people are emotional, angry, and possibly drunk that things will brim over at times.
It does seem to be a bit of a cultural issue to be honest. I mean that in the sense that violence at football games seem to be overly represented in certain countries compared to others, even though football fans are segregated in pretty much every country. England's not even near the worst offender, obviously. Wouldn't dare go near a home stadium in either Turkey or Poland not wearing the shirt of the home side