Honestly, it's rather pathetic. This is something that i think really hurts the image of soccer. It's amazing how idiots in stands will fight each other over a stupid game. RARELY is there any sort of fighting in the US in ANY sport. The Detroit Pistons vs. Indiana Pacers was the largest fight there had been in a LONG time. However, are there ever fights between Red Sox and Yankee fans? No. How about Celtic and Laker fans? No.
However, i often hear about scuffles breaking out in the UK or other Western European countries over a football match or in some Hispanic country. Soccer/Football, whatever you call it, the leagues need to be able to control their fans.