Football seems to attract a certain type of person who revel in the tribe mentality.
I am a Saracens season ticket holder and I also go to as many England games at Twickenham as I can. Not once, ever, in all the years I have been attending rugby have I seen any trouble.
Whether it's domestic games or International games the fans mix with each other and sit with each other perfectly happily.
Only last week, before the Eng/Arg game, a BBC reporter was standing outside the ground saying the English and Argentinian supporters had created a party atmosphere and were drinking together. Can you imagine this EVER happening in football?
It's the mentality of some football supporters that turns them into invective-spitting racist, violent idiots. You meet a better class of person at rugby.