When ds2 was a toddler, he had trouble with his hearing and needed an operation to correct this. This led to delayed speech and language, causing meltdowns when he was unable to communicate.
Fortunately Labour was still in charge and we gained access to a couple of amazing speech and language therapists who supported him, us and the school to find solutions that worked for him.
He then also had dyslexia so school was incredibly challenging, and I remember reading several reports which said that a very high percentage of the prison population had those issues. Dh and and plus those around us worked really hard to find solutions, tips, tactics, anything that might help.
When he got angry, he would write notes and tear them up or burn them.
We got a punch bag.
He went to a martial art (now holds a black belt, has completed some of the courses to become an instructor).
He had breathing exercises to calm himself.
We worked with his schools to ensure he had things in place to support him, so an exit pass from lessons and a safe space he could go to. Fortunately his secondary school didn't start to suffer from a lack of funding until he was going into year 9.
Support in early makes a massive difference to the outcomes of vulnerable people and that has been lacking in the last twelve years.