A 13 year old who had commited murder in the UK would have gone to a specialist unit, would have been fully educated, had regular sessions with a psychologist and treated like a human.
And if on good behaviour would be given the chance to be realised and have a life. The USA is much less humane. They have locked up teenagers who will die in prison.
And so they should. I don't want anyone who's butchered two innocent old women out on the street. Ever.