Just reading through the article once here (rather quicklY), but I'm trying to figure out how this is MK fault at all. I mean, how many games (and tv shows, and movies, and almost anything else) has some kicking in it? This really sounds more like the kids were saying what they did, then later, they were asked if they play any video games, they say MK, and someone linked the two together.
Also, these are 17 year olds (ok one 16, one 17) beating up on a 7 year old. If neither one of them could see that this was wrong, this isn't MK's fault, it's their fault. Maybe we should just be happy they only killed one person, as opposed to driving and killing 20, when they cause an accident like they saw in Burnout.