To him, rules are an irrelevance.
Ever had a child like that? Who actually really doesn't care and who isn't afraid to smash in doors if he's pissed off?'
'And now I don't care anymore. I think it was when he punched me in the head and tried to get out of the moving car after I told him calling sister a fat whore was unacceptable.
You know, there are some rotten eggs in the works. Perhaps he's one of them.'
'He'll just bash and bash at the doors until it breaks or the neighbours call the police. He doesn't care.'
As a PP has said, he could end up eventually in prison for some reason, if he carries on like this. Yes, some people are different from others, but there's still some stuff that can be done, especially when they're still children.
IDK what the counsellors were that he's seen, but a psychiatrist is the appropriate person qualified to treat stuff like this. After assessing him, they can then perhaps refer him to someone who can help.
You have to speak to the professional and go in with him so they know what's actually happening and he can't just charm them.
A generic boarding school wouldn't be ideal. He needs, if anything, somewhere suited to helping children with behavioural issues.
I don't mean any of this horribly or anything- I have mental health problems and stuff myself, and the earlier these things are dealt with, the less likely they are to cause issues in adult life.