Sadly, this seems like it’s likely a case of psychopathy. Technically you can’t diagnose minors with it, but they have pre-adult terms for the same thing.

Children at that age, at least according to the majority of modern research, have extremely low rates of successful behavioral reconditioning towards socially acceptable norms. It’s almost zero.

The best researchers have been able to do, even with extremely intensive treatment, is to slightly curb their most violent and predatory tendencies.

I agree that we should take a non-retributive approach to justice, but the sad truth in these cases, at least as far as we know right now, these folks cannot be fixed and reintroduced into the general population, they are too dangerous.

Their brains, either through genetic misfortune, or through extreme sustained trauma from infancy, are permanently malformed. They lack any significant capacity for empathy or love. They cannot relate to other people on any level, especially emotionally. Their brains are literally not wired for it, as awful as that is.

We shouldn’t throw them in a hole though. They should be permanently imprisoned in specialty facilities that constantly treat their mental disorder and try to employ them in productive jobs that can help society. They should be provided proper medical care and resources, possibly tightly supervised short term release in condition of exceptional behavior and treatment response.