You state that video games are fine. WoW is a video game, therefore it is fine. But then you go on and state you think that WoW is not good for society, blatantly contradicting your first statement.
To bring an overdone statement in to the mix: "guns don't kill people, people kill people". It isn't the game, it is the individual who already has addictive tendencies. It doesn't matter if it is WoW, another game, or another activity people who are predisposed to addictive behavior will tend to go overboard on their chosen activity. It isn't WoW's fault (because if it is, then many other games should be brought into this blame list).