I grew up playing violent games and I turned out fine. However, my parents were completely ignorant about video games. My mom wouldn't let me have Mortal Combat but had no problem buying me the original Grand Theft Auto, Syphon Filter or Metal Gear. The games had no effect on me and I grew up fine but theres definitely kids who are a little crazy. I don't have kids but if I did, honestly, I would not buy them violent games until they're older and mature enough to handle them. Then again, I know better and am up to date with video game news so it'll be hard for them to pull the wool over my eyes
. Unfortunately, the parents that are the ones that complain about their kids playing violent games are the ones who have no clue about games, buy it for their kids without even so much as a Google search, then see what it is when their kids play, then blame the games when the kids act up (even though they are the ones to blame for not being more active with their kids lives). I have a good example of this.
A couple years ago, I was in GameStop preordering a game and I got stuck in line behind a woman and her young child. She's at the front and asks little Johnny "What game do you want?" He yells out Call of Duty (I forget which one, lol. Though they're all the same game so doesn't matter
). At the time I played so I was thinking 'great, another 8 year old to annoy me'. The guy behind the counter stops and asks the mom "Do you know what this game is about?" The mom said no then he began to explain the game. She turns to her son and said "You are out of your mind thinking I'm going to buy you this game." I think the kid threw a tantrum but I applauded the clerk. And if it wasn't for him stopping it, that mom would have just been another statistic complaining about games. Honestly, IMO, we need more proactive store clerks like that too to help educate moronic parents 
A couple years ago, I was in GameStop preordering a game and I got stuck in line behind a woman and her young child. She's at the front and asks little Johnny "What game do you want?" He yells out Call of Duty (I forget which one, lol. Though they're all the same game so doesn't matter