I agree that all video games have some degree of influence (especially on young children). I personally don't like to play extremely violent video games (I don't own any m-rated games), and I think video games are starting to get too realistic when it comes to violence.
In my opinion, a game with lots of blood and gore can desensitize a child (and adults too), and he may not see any problem with killing someone. In addition to the amount of violence, the overall plot of the game is important too. I like to play "good vs. evil" type games. I don't see how anyone could EVER play Grand theft Auto. Some people use the excuse " its just a game. I wouldn't do it in real life." However, if you wouldn't kill innocent people in real life, why on earth would you want to do it in a video game.
Overall, some violence in games is okay, but people need to be careful.