Uh no. It’s not lack of belt.
Go to an ABA treatment center. You will see very disabled kids.
Saying take a belt to them is like saying to beat a mentally retarded child until he becomes valedictorian.
We will have to agree to disagree. I grew up in the sixties. Somehow we all managed despite not being “diagnosed” with something.
I have to think constant junk/fast food, zero exercise, constant screens is not doing anyone any favors.