Did he have much agency in this case? He texted his mother about hearing demons and ghosts and she did nothing. He kept a baby bird’s head in a jar and tortured other animals and his parents sought no help for him. Instead, they bought him a fucking gun. He very clearly has some form of schizophrenia and/or sociopathy. When the obvious signs are there and the people responsible for him (his parents) actually enable his violent tendencies, can we really be surprised that he acted them out?