I normally steer away from the hot-button topics in forums like these, but I'm compelled to post in this one...
I've played games of various kinds since I can remember... friends consoles, Commodore64 computer club at school, IBMs from the 386 upwards, PS2, etc... that's everything spy hunter and tank wars to a Predator game to wolfenstein and doom to Doom3 and GTA:SA. I think I've run pretty much the whole gamut from violent to cute, via strategy, puzzle-solving and roleplaying.
I've also been heavily involved in a range of martial arts, fired various guns at ranges (I'm fascinated by guns, not because of the violence but because of the chemical power and precision in the device, as well as the drastic historical influences). I've also seen various hectic movies, read quite disturbing books, and listened to a massive range of music, from big-band to just-released metal (I'm not a huge fan of death metal, cos well, I just don't get it :( )
I'd say I've been exposed to the full spectrum of commonly-held-to-be-negative influences, including un-sunscreened sunlight and burnt toast. I believe there is even asbestos in the cement of the water pipes in my area.
My point, in this ramble, is that while I'm fairly convinced I am high on the cancer risk, I have absolutely no desire to go out and murder anyone, bloodily or otherwise. I've screamed at fellow roadusers a few times, but mainly because I know they can't hear me. I'm slightly paranoid, but I think that's because I actually read the newspapers on a regular basis.
I'm sure anyone who'd played with me on here can attest to me not being hugely normal or stable... and yet all of these terrible influences have failed to turn me into a maddened killer with a fireaxe.
Funny how the people ranting on about evil videogames have failed to mention all the millions of people like me, in order to hilight the few people who might have been contaminated by bad games and/or music videos or whatever. One would think their time would be better spent fretting about all the people killed by bad driving on a daily basis.