Breitbart is not a reliable source/purveyor of such information. Let's get that fact out of the way first. Terribly written article that muddies things up more than it illuminates. Secondly, did anyone read the article, the linked article, and actually ponder the three surveys that referred to? The five most violent stadiums where people actually witnessed violent episodes (is there any real stats about this beyond fan surveys?) are...
--Eagles stadium
--Cowboys stadium
--Patriots stadium
--Giants/Jets stadium
--Browns stadium
Also, Lumen being the 5th most violent stadium is wholly inaccurate. They were talking about neighborhoods where stadiums were located and their crime rate. Of course stadiums located directly in the urban center are going to have higher crime rates around them than stadiums in suburban areas away from urban centers.
There's more problems with the article and it's main link. Just a mess of an article.