It sounds like colleges for the most part, don’t want to know and don’t care to protect students or staff.
This only strengthens the need for students and teachers to be allowed to carry concealed weaponry.
Nobody will know til “hell breaks loose” and the only line of defense will be immediate and self-protection of oneself and the ones around self.
It goes to the problem of moral relativism. "Rules" and "findings" are designed to eliminate every possible situation where a bureaucrat might have to make a "value judgment". Just do it by the book and your job is safe.
Bureaucrat thinks to self:
"Let's see here. Student has exhibited past anti-social behavior. Diagnosed with a disorder that poses a threat to students and society. But, heck, he's graduating and it would be unfair to "label" him for potential colleges. So---I go to my little rule book---and, voila!, there's the rule that says I CAN'T inform them. Whew. Saved by the rule book...no one can blame me! It's the law's fault!"
[ed: apply above rule to falling bridges, killers out on parole, etc.]