If these kids enjoy violent video games, is it because of some addictive quality of virtual violence, or is it because they needed to satisfy that destructive urge?

Put yourself in the place of a 13 year old boy. Mom and dad are divorced. You get to go to court a few times a year because mom and dad are using you as a pawn for resources and not really paying attention to your needs as a 13 year old slamming into the wall we call puberty. Because the "adults" in your life are shit you pull inward. And were do the awkward 13 year old boys go to deal with frustration and the need for community? Plug in the PC/XBox/Switch and play games. Online nobody gives a damn if you are a poor kid in South Chicago or a Hillbilly in West Virginia all that matters is can you play. Now you have an outlet. Play enough and you start to see the same faces and build a report with them. Some of those people will even become friends.

Everyone needs an outlet for anger, hostility, frustration. Video games are making people LESS violent. Not more. There will always be outliers. But the reality is that we live in the safest human society ever created. The odds of you, even in Russia, being the victim of a violent crime is near functional zero as long as you are not involved in the illegal drug trade. These mass shootings get a lot of press and I would like to prevent these things, but even adding them to the total, violence is down.