I'm going to reiterate what has already been said in this thread. The game is not what ruins somebody's life. IF the individual in question is so attached to their online persona/life and is loathe to be torn away from it then they have much deeper issues. It is not fair to say "OMG WoW is EVIL and ruins lives!!!1" because that is simply not the case. The large majority of the population playing WoW regularly are stable people and it's the small percentage that ends up on the news.
Violent video games do not make murderers, either.