What a depressingly stupid comment.
Firstly, this article is about the impact on the protagonists of taking part in a massively violent sport. It has nothing to do with fan violence, which is another issue altogether and simply isn’t referenced in this article.
Secondly, fan violence in European and South American sports is massively overstated in the United States, and is broadly on a par with violence that takes place at any large gathering of people in those countries. You get more violence on an average Saturday night in a reasonably-sized English town than you do at, for example, an EPL match.
I regularly attend football matches at a lower level, and, although there are occasional violent incidents on and off the pitch, my level of apprehension is nothing like the level of apprehension I have going out for a drink on a weekend night in, for example, Colchester.