Doesn't change anything pertaining to yesterday's appalling events but when I was a civil servant, I watched a virtual meeting involving the head of Ofsted, a chief constable, someone from the MoJ and someone else. The thing I remember from that was that there was often a linear pattern.
- Social services would be involved with a problem family.
- The education system could spot kids who were troublesome, and likely to remain so.
- The local police would see kids who they knew were trouble.
- Those kids would often end up in the justice system.
The earlier you intervene, the better chance you have of mitigating problems but if the kids have a family issue, that can be difficult if not impossible. There's a whole element of youth training/education/employment as well.
The other end of the process is when they're in the justice system, and there are opportunities to intervene and remediate. But it all requires joined-up thinking and adequate resources.