Since it's moderated, there's a chance my comments won't be published, so I'll reproduce them here.
It's always astounding to me that college professors, who are supposed to be some of the most intelligent and educated people among us make these kinds of silly arguments.
Here's two things you need to think about. The disturbed persons who bring guns on campus to kill people don't care that guns aren't allowed on campus. Guns were banned at Virginia Tech, yet that didn't deter the shooter at all. So making guns illegal does nothing to solve that problem. As the writer points out, awareness and intervention are the keys to handling troubled people.
Secondly, most states require that you be at least 21 to obtain a license to carry. So very few of your students will even be allowed to carry legally on campus.
Furthermore, those who obtain licenses are the least likely people to use a gun in anger. In Texas, where I live, the state maintains statistics on licensed carriers. In over 20 years of maintaining that database, license carriers have amassed a record of being 17 times less likely to be convicted of ANY crime than the average citizen. In fact, Texas licensed carriers are even more law abiding than Texas law enforcement personnel.
College professors should be the most fact-based evidence-based persons among us. Instead they are filled with fear and irrationality and emotion. They lash out at everything they don't understand, just like little children do.
It makes one wonder just how effective higher education is at actually teaching intelligent thought processing, fact-based research and evidence-based opinion forming. Given the silly arguments we see, like this one, the evidence is that they are not teaching those skills at all.