While it isn't an excuse to injury anyone, maybe those protesting don't want sexual deviants flaunting their perversion on city streets with government approval. I can certainly sympathize with belief.
Yeah, I'd agree if that was really their point. Soccer hooligans are special breed of troublemaker though. I doubt they were attacking the gays to protect moral decency. More likely they were just looking for a reason to fight as is usually the case with these people.