One thing I forgot to mention and I certainly do not want to pander to the larrikin minority. But there have been reports done on soccer crowd violence and one of the reasons was the lack of scoring - the fact that a goal was so important and that the score and the game were often not related.
One side could be completely dominating the game but losing or the other side gets a beak and scores the only goal of the match. Not to mention poor refereeing which decides an entire game - eg. giving or failure to give a penalty.