Seran seems to be forgetting that this is at least the second red flag that the school was aware of, the first being him Googling bullets while at school, the second being the drawing.
If the school really felt he was a threat to himself or others to the point where they bring the parents in immediately after seeing his drawing and recommending he see a professional within 72 hours then every adult at the school who had a hand in this is just as guilty as the parents.
Again unless the DA pulls evidence out of her ass that the parents knew more than the school did and kept it a secret, but that seems unlikely unless the parents turn on one another for a plea deal.
Honestly do you even know what a charge of terrorism entails? I'm assuming not. You once again seem way over your head and don't understand the things you are arguing.