I do believe so. I think these latest crimes are starting this to be investigated. We are on the second generation of kids now who have been brought up with 'instantaneous health reloads', No blood and gore (in real life), and No appreciation for life, Games. You see kids all over who think they can just do what ever they want, with no long lasting repercussions. They have been emotionally dulled to think that, like in a game they can just hit the 'reset button'. There is NO 'reset button' in life.
It depends on the person playing the game or committing the crime. Like if someone is smart enough to not take everything in the game seriously then i they are most definitely not going to do anything violent based on the game. But if someone takes the game too seriously and/or does not have a very well developed brain then they might do something violent based on the game.
Violent games won't cause people to become violent. But people who are prone to violence in the first place may be influenced by violence in games, films, and television. Repeatedly viewing scenes of graphic violence desensitizes people to violence, in other words violence itself becomes less shocking and distasteful. And it is a fact that the military sometimes uses first-person shooter video games to both train soldiers how to target and shoot multiple targets and to help them overcome their natural aversion to shooting another human being.
Only people who never play video games think that. But in actuality, it has little effect. To a certain point, it promotes logical thinking and problem solving. Some games have bold and extravagant story-telling that you can't find anywhere else. I do agree that some games are a bit mindless. Not to mention excessive in certain things such as gore, blood, and shocking scenes. But there's ratings for a reason. Rated M for mature, not rated M for "Mom bought this game for me". Therefore don't buy your 12 year old Call of duty and give him a headset. For the good of everyone else, thank you.