Does violence follow football?

I’m not talking Handegg. I’m talking UK football.
I’ve been to my first match today. It wasn’t out of choice it was because I was working, I was there to sort out radio communication problems. I was situated in the control room at Ellend Rd for Leeds UTD V West Ham UTD.
At kick off alcohol was no longer served much to the disgust of the West Ham fans who smashed the bar up and for the entirety of the match there were scuffles and people being ejected from the ground left right and centre.
I was surprised on leaving that people take children as young as five to these matches.
There were some serious meat heads kicking about and I’m not small but I still felt out of place.