Thats a load of crap, if they dont know at the age of 15 16,17 that killing someone is wrong that is not a parental issue, they obviously just dont care and are arseholes and deserve to die, cus its morons like that in the world that bring it down
It is a parenting issue. My guess is the kids have never been punished for doing a single wrong thing in their lives and Call of Duty is a better parent to them than their actual parents.
I'm not saying video games made them violent. I'm saying their parents likely didn't want anything to do with their children which is why one of the dads could say "my kid could never do anything like that" or something similar. He didn't know a single thing about his kid.