Although guns had been banned on campus ever since a fellow blew his brains out in a dormitory, after this shooting enforcement became very lax and you could tell there were gun toting students on campus. They'd come to fear the roving terrorist killers more than the corrupt campus administration. (That was in the days of Miles Brand ~ who is now dead)
When the schools fail to make campus safe it's morally correct for the students to do so.
I’m betting more are carrying - problem is, if they stop a shooter they’re the ones who’ll be in trouble and expelled.