Hate the Parents, Not the Video Games
There are a wide variety of video games out there, and yes, some are extremely violent. Same goes for movies, TV shows, and even good, old-fashioned books. If you don't want your kids playing these games (or consuming any other similar media), be a responsible parent and deal with it, but don't go playing the blame game every time some senselessly violent act occurs too close to home, crying for government regulation.