The parents should be held criminally responsible.
The father is a lot like one of the Columbine fathers - who refused to accept responsibility for his son. It leads you to want to know more about his so-called fathering (and mothering) skills. Have we heard from the mother?
Interestingly enough the parents of the Columbine killers didn’t seem to notice their own kids using chemicals to cook up and assemble bombs in the house.