Whilst I am as passionate about my sport as anyone, I never could understand the mentality of this sort of behaviour when it comes to "Supporting" my team. As a teenager I attended games every week in England, when hooliganism there was at it's peak - My friends and I, all lads who enjoyed a pint, could talk football till we were hoarse, wnet out of our way to avoid the hooligam element, be they from visiting thugs, or ones who were allegedly "fans" of my own team, and tried to enjoy the beautiful game.
No doubt, this will be reported as Police brutality in some quarters, and I do not wish to speal ill of the dead man, who may have been simply caught up in everything, but, it wasn't the police that threw a missile at the goalkeeper, or tore down the wire to get at the "animals" on the other side of the cage - I don't envy the police having to deal with this kind of neanderthal behaviour.
I'll stick to watching rugby - where the aggression takes place on the pitch....