Indirectly it was "our" collective fault...football hooliganism was a sport in itself at the time - even for those of us that just used to watch it happening, with secret pride if our yobs won the fight, or disgust if they lost...it helped propagate the violence & indeed proliferate it. Society seemed to accept it at the time otherwise government would have took steps to solve the problem sooner.
Having said that - I still feel bitter about missing out.