American Bill Buford attempted to dissect this mystery in his book, Among The Thugs. While living in England, Buford latched onto various platoons of Manchester United supporters. I think Buford went into this endeavor believing he could provide evidence of a link between football violence and The End of the British Empire. I think he too readily believed that football violence was an outlet for unemployment and other such economic discouragements.
The problem was that as Buford befriended many of these so-called hooligans, he found that many had good jobs and were enormously likable people. What might appear to be unimaginable and incomprehensibly violent acts were a sort of hobby for these folks. Perhaps what happened today is not a statement of labour discontent. I suppose it is more frightening to see it as a nihilistic outlet similar to the one that the combatants sought in the film Fight Club.