Parents claim that video games makes us violent let me say something people used to kill in 1850 too and there were no computers that time.
just Human Nature.
When you are ready to Kill you will kill. it has nothing to do with Gaming but mental disorder or long time abuse or lust for revenge.
But not be too relaxed there is a saying excess of Everything is bad And we all know there were crimes committed by Gamers too and the way they show in Games.
here is a nice Documentary by RT showing both good and dark side of Gaming.
Yes there also can be dark and horror side of Gaming so A Child can learn very effectively if you give him positive Things he gets it quickly and if negative he will ruin himself So there is a Good logic Behind The Age PEGI type of thing which is marked on every Game.
Human nature it always find someone to ask for help does not matter if it is God or Science.
It is in our Nature to worship maybe that is what makes us human.
We see Muslims,Christians,Jews,Buddhist,Hindus etc all worship.
Even those who hate religions seems to like and Worship Satan.
First people used to worship fire then star and sun and so on. now a days people worship Machines.( you may not know it but it is happening)
it is just Human Nature.