Add to that a shooting scenario is now less likely because other people are allowed to carry and the shooter could be intercepted before causing harm now. I wonder if these morons will ever learn that their fears are completely irrational? This falls into the same category as employers who don't allow employees to carry because that might foster violence in the workplace. I would bet good money it would do the reverse and we wouldn't have to have active shooter training talking about running and hiding in a locked room...
I suspect the professor in question has no or negligible concern about actual predatory criminals and violent crazies. He's exclusively afraid of regular people who take responsibility for their own safety and choose to be armed. If he has to face that reality, he has to face that he has abrogated that responsibility and is at the whims of the bad people he dismissed.