The school HAS the ability to intervene in such situations,
Mon Sep 18, 2017 1:17pm

PLUS, law enforcement has the ability to use a written or verbal threat to intervene & investigate as well. Granted, they cannot JAIL someone prior to doing something illegal, but threats ARE criminal and they CAN investigate to ascertain if the threat is viable or just noise. If the person has accessible weapons, they CAN confiscate them if the threat is deemed viable too.

That is not a "proper liberal intervention", it is a reasonable, INTELLIGENT intervention that should be employed by whatever political persuasion one might be.