Well of course violent games are the ones getting targeted. The content in them is rather controversial. Especially when that content gets released to an audience the game isn't targeting, example given, "M" rated games, targeted for an audience of players who are 17 an older, yet, this material is exposed to children and the like day in and day out, and at such an early stage of development, it can have an impact on the mind and possibly influence that individual to do or act in a way. It's no different then a child dressing up as the Grim Reaper or some other demonic figure, chances are they got the idea of that being "cool" from an older person or a game.
It's only crazy to you because you aren't thinking outside the box. It's no different then the thread about a guy who's parents won't let him play M rated games and he's 15. You have to think how the content being displayed will affect the entire population of gamers, because younger gamers like Mature Content and more then not, will get a hold of it some way or another.