Retired Marine Colonel Dave Grossman is an OUTSPOKEN critic of violent video games, and has been a leading voice at Congress Hearings and for various watchdog groups.
He alleges that as per military training, soldiers play Doom and other one person shooters to "condition" them for killing. He believes, in his self-named "Killology" that because the military uses these games to teach their personnel to kill, that the same effect of conditioning kids would happen too.
I think the guy's wrong because the number of players to crimes makes it ridiculous.... but I just wanted your feedback.
Google Searches:
http://www.killology.com/
http://www.tgorski.com/Violence/Davi...n_04-23-01.htm