Just spitballing here, but I kinda wonder if modern tech isn't worsening children's impulse control. Having constant instant gratification surely has some negative effects on it.

Anecdotal evidence here, but my friends who are parents cut way back on how much tech time their kids got, and they said there was a huge improvement in their general behaviour.

I literally have never seen a kid on a leash IRL (I'm not American) nor heard anyone say "goddamn this kid is so hard to raise, lemme put him on a leash". Never seen a pic of my gramps on a leash, or a history book showing leashed kids. Through millennia kids have been properly raised without leashes. So, I ask again, is this not just another example of how incompetent people have gotten at being people in some areas of the world?