No, the games alone are not to blame. I mean, how to blame a game anyway. However, if you ask whether violent games have an effect on children, then seriously, how could they not? Or why would you think is there a huge industry shoving learning computers and learning games/programs down our throats?
And say, what is this environment? Your parents, what they teach you, what you see them doing? Friends you hang out with, their activities? Something like school, people at school? Your activities there? What you do in your freetime? Like, reading a book? Talking to people? Playing a game? Isn't this all the environment somehow?