This boy should have been in secure accommodation. Probably pushed onto the family or they insisted they could manage him. Both wrong.
He started displaying signs at age 13, and it is very common for serious mental ill health to manifest alongside puberty. This would have been in 2019, a time when all mental health services had already been gutted by austerity, and the threshold for even getting an assessment would have been very high. I'm also concerned by the way his mother appears to have placed her faith in an online religious healer and I wonder whether there was help seeking behaviour from the parents. I know from personal experience how incredibly hard it is to get support, I've watched my DS go through it. Fortunately the only person he ever tried to harm was himself.
Axel Rudakubana was grown in a perfect storm, or so it seems. I'm not for a second saying he doesn't bear any responsibility, but all the systems failed where he was concerned.