its stress relief
Back when I was a kid the only computer games were Pacman and Space invaders .. Yawn. I took up Sword Fencing , Karate , Broadsword reenactment etc as methods to deal with the emotional bullying I was getting at school and in the first five or so years after leaving.
Now 20 years on and I brokne knee I find that when I get stressed I get agressive, so I load up something like Call of duty and go kill some computer sprites. Half hour later I'm bored, but I'm also calm again.
I';ve never attacked anyone without them first drawing a knife on me or coming at me mob handed and I have no desire to snipe at people despite that being my favorite type of computer role, plus booby traps since they spark my inventive mind.
I've read that Computer games can teach you to be violent, take it from me , presssing buttons on a joypad thingy will not teach you how to parry a blow with a sword or punch someone in a pressure point, they take physical practice to train yout body coordination and muscles. Why else does Karate do the repetative Kata's.