Spot on, in so many cases. We were told much the same thing, years back when we were working with family therapists with the kids.
When they blew up somewhere, they were not making a mental choice “Hey, I’m gonna raise some hell here”. They were, genuinely, upset and incapable of controlling their behavior. I got the impression that the learning curve is in their figuring out how to stop things from devolving to the blowup point. School was a different-enough environment that there is a built-in “hey, waittaminnit” switch in the brain. Home, being much safer, triggers no such pause.
My daughter did not have that “pause” ability, in most places, even at school. I don’t think she ever had a violent meltdown there, but she did in several public places. She got better, over the years…
A story I love telling is that when I was young, I had allergy shots on a regular basis. As with any young kid. I disliked them and would cry after each one.
One time, when I was not quite 5, I basically melted down in the waiting room. Screaming, grabbing things, you name it. I was, by golly, NOT going back there. I was truly upset.
Mom had to pry my hands loose from the furniture, and drag me back. As she was about to go through the doorway, I stopped screaming, announced “When I’m 5, I won’t cry any more when I get my shots”… and resumed the meltdown.
This has GOT to be one of the times where Mom was torn between smacking me, and laughing. She did not smack me, and I did not notice laughter.
But when I turned 5… I no longer cried when I got my shot.
Yeah, I had a lot more control than I thought.
Anyway, more pertinent to the OP: I think that some people have not been taught, some CHOOSE not to exert control (like me at the doctor’s office), and some are genuinely incapable of it - my autistic nephew is in a group home and has roughly zero impulse control, nor any sense of the consequences of his actions. He has destroyed electronics because someone else was spending too much time with them (e.g. the TV, or my brother’s iPad)… then is upset later on when there’s no TV to watch.
Most people in the first two groups CAN learn better control, but they have to choose to, or be shown why it would benefit them to learn. As far as how to tell which category? I suspect it’s a combination of whatever syndrome (in the one case, autism) and background.