I do agree, Simon. It is that screen time supplants the getting out and playing, the rough and tumble —the walking and talking.
And the not having a father? And a lack of respect for authority? It is a tangle of factors—fathers who often were rough , perhaps not emotionally available, often drunk when they came home( there was a lot of drinking that went on) and very authoritarian didn’t model perfect manhood but we still didn’t have mass shootings.
There is something that happens when one parent is home when children get home from school. There may be chores and the children can go out and play ( maybe are kicked outside to play). Video games alone don’t harm s child.
Social Isolation - from father, sister, brother, mother, other —that makes a loner.