So the system successfully identified the kid as a threat, but was not able to prevent the shooting because the father bought the guy on behalf of the shooter.

How would you even prevent that? No way the 2a nuts would go for a temporary ban on firearm ownership (or at least new purchases) by family members. Besides something like that could be used maliciously very easily. You can’t take all the kids who post edgy shit online into custody, we just don’t have the budget and it’s probably not the right move anyway.

You could mandate therapy or some other mental health intervention, like a biweekly visit with the school’s counselor. But those nerds don’t need any qualifications so they might not be able to identify a credible threat or help talk a shooter out of their (likely unknown to the counsellor) plans.

There are a gajillion things we could try, if not for the blind ignorance of the 2a nuts.