To be honest the way in which supporters are treated at football matches has always been the problem in my opinion. Maybe this is more relevant to away supporters but being met by a police presence that threatens and treats you like a criminal from the second you enter an area that's close to the stadium to the second you are marched away from it has never been a good trait. That and the segregation that follows is then going to enact tribalism before anything else.
I work in London a lot and talk to Arsenal, Spurs, Chelsea, etc, supporters in the pubs that I go to and have a laugh and talk like adults and generally have a craic. Put me 50 yards away from these same people but with the difference being we are separated by barriers in a tribal type atmosphere at a match and I'll be pointing and shouting all sorts of obscenities at them. I might even offer them out in a fight, knowing quite well that I'll mix into the crowd and disappear and not have to have the fight.
Football supporters have been treated wrong for too long now but it's gone too far too change. Whether you are sitting on your arse or standing up the police will still treat you the same wherever you go.
We wouldn't accept this treatment off the police if we went to a boxing match, a concert, the theatre, the rugby, the tennis but its acceptable when we go to the football?
A lot of things need to change before we stand people up but I'm not sure they can.