In my circles it's common knowledge that what you observe in the behavior of children is an unfiltered reflection of their home environment. When kids are violent, loud, abusive, it's very likely that's what their home looks like.

It's surprising to me that this is being portrayed as some kind of discovery/revelation.

My father would get very frustrated and violently angry when things didn't go according to plan, particularly in the garage when repairing something under time pressure. It took me over a decade living away from that environment to completely shed some of the same behaviors I had picked up just being around it.

Nowadays there's an Isaac Asimov quote I tell myself whenever such situations emerge:

"Violence is the last refuge of the incompetent" - and I'll add "are you incompetent?"