I do agree that TOO MUCH videogames do have social and health downfalls, but not so much as to call them bad.
But for most, it's mostly becasue it's the newest form of media at the moment and is not widely accepted the way TV or movies are. Also because alot of people don't understand them to the fullest and alot of the most vocal people against videogames don't even play them and never will... hence never giving them the chance. And, most of those people are old biased fucks that are set in their ways and have no tolerance for anything new or something they don't grasp on a mental level.
There's lots of reasons actully, whether its personal, political, or religious agenda driving it... even ignorance.
Fuck em.