Hooliganism: Rugby vs. Soccer

It's no secret that European soccer fans have been the source of hooligan activity in Europe.  Have you ever wondered why such a violent sport like rugby doesn't have more hooligan activity.  It's very interesting because rugby fans, like many American sports, are integretaed in the crowd.  One teams doesn't sit on side A while the opposing teams sits on side B, like in soccer.  So why do more altercations and acts of hooliganism not occur?  There are a few theories out there that answer this questions, one of which is the fact that the athletes on the rugby "pitch" are undoubtedly the toughest people in the stadium.  Majority of the fans who watch Rugby have been involved in the sports at some point in their lives and understand how tough those athletes are.  There's the fact that you can legally use violence to release frustration, and the fact that a couple plays later the opposing team can do the same.  The officials of Rugby matches are often not held responsible for the result of a rugby match, often times the bigger, smarter, stronger, faster team will win.  

On the flip side soccer is a sport where it is more of a "non-contact" sport, but enough contact is present to hurt people.  This may make give off the impression that these athletes are not tough because they can hurt someone by kicking them or shoulder charging them from behind.  Soccer is frustrating because of how the game is interrupted because of the smallest amount of contact and how the scoring system is so yes/no without any alternatives meaning that games can be won/lost on the tiniest of margins.  Passion turns to rage in soccer and rightfully so because they cannot legally hit someone like in Rugby.  The frustration on the field filters over the fans.  Fans are denied the opportunity to see the athletes on a soccer field completely annihilate another individual, which may suggest that the fans think they are the toughest ones in the stadium and not the athletes.  Often times the fans and the crowd will try and prove this theory to be true