...We were told last year that he wasn’t allowed on campus with a backpack on him...
That says just about it all about this psychopath.
Yes, says a lot about school officials who felt his that serious a risk, but didn't contact authorities. They, teachers and administrators, need to be trained, again. They need to be shielded from lawsuits over mistakes, other than negligence. And there needs to be either a time limitation, an appeal process, or both about stripping 2nd amendment rights from someone committed to an institution.