Like everyone has said, this is yet another attempt to blame something tragic on something other than the human being that committed it. After Colombine, the great evil was on black trench coats. This movie blames it all on D&D. PLEASE! A coat is a coat as much as a game is a game.
I have another issue here. In this movie it was very clearly implied that only quiet alienated creepy loser-type men played these games. Perhaps this is a (subtle) wink at the idea that only men could be influenced by a work of pure fiction, but I have to think it's further proof that the makers of this movie, and the author of the book it's based on, did not bother to research the game itself or the players of it. Did they talk to players of RPGs that have not killed anyone? I think there are MILLIONS of them out there, both men and women, yet they must focus on the one young man that may have had something to do with a murder. I know, I know, before you say it, I know that a story of a perfectly socialized person who also happens to play role playing games would not be a very interesting movie and could not have been nominated for an Oscar, but it would have been closer to the truth than this *thing*.
All I request is that people THINK before they imply something that alienates a large group of harmless, friendly, NON-angsty people. Is that too much to ask?