Does football(soccer) breed more fan violence than other sports, and if so, why?

As mhendo pointed out:

As an interesting bit that shows how the sport is not likely to be the issue, in the 1960’s football (yes, the American sport.) in Mexico was very popular at the universities, and the rivalry, other unrests and heavy hand of the authorities back then, generated riots and then a massacre.

I became aware of that in the 1970’s via a Mexican political comic; they pointed out that, back then, there were opinions in the Mexican press that blamed the violence on American football as it was seen by several then as a very violent sport that incited the same. So, besides the government heavy hand, the blame was conveniently passed to the sport and it lost a lot of popularity in Mexico.