I agree that the parents made some exceptionally poor choices. Based on the article I read, the principal did, too. Let’s say you’re the principal of this school who is charged with the welfare of all individuals on the campus. You have multiple employees raise concerns that a kid is making general, non-specific death threats and the kid is throwing red flags of a mental health problem at best or crisis at worst. It’s so concerning that you put the student with the school counselor (who may or may not be trained to handle this) and summon the parents to the school and tell them to get the kid into professional counseling within 48 hours. You’re going to let that kid remain on campus and return prior to getting with a professional?
Maybe I’m crazy, but that seems to be just as negligent.