Another take on it

So, I read another article about the sociological aspect of the football hooliganism.  This one talked about how the main reasons behind it were many time political, especially in Spain.  The Catalan teams' supporters are very politically tied to their teams.  They also said that the media coverage of the issue and the police interventions probably make it worse. Many times the tensions on the field affect the crowd as well, but this violence would happen while in the stadium.  It also argued that much of the violence away from the football grounds has very little correlation to the teams.  The games more or less provide an excuse for the firms to engage in a fight, which is many times organized and planned.  Of course, if the clubs are huge rivals, this would add another dimension to the fight as the supporters would most likely hate the rival team's supporters that much more.