The problem is that this person is only thirteen years old, living with parents who haven’t bothered to enroll him in school, much less stop supplying him with weaponry. The juvenile justice system is hopeless with thirteen year olds who are already hardened criminals. It will fuss therapeutically with him during his brief incarceration (assuming he gets any jail time at all) and then release him to the very same degenerate parents.
He’s so breathtakingly young! Many decades of gun massacres ahead of him.