I suspect there are people out there who are not 100% like you, however.
I'm not saying that video games cause people to shoot people. But it's possible that participating in violent games like that could set off the wrong person who perhaps already has a predisposition to do something like that.
Clearly - not everyone who plays games has turned into a mass murderer. There are very VERY few of them.
But that doesn't mean that games don't play a role in those who do become mass murderers.