Here's another article on this topic:
http://www.kold.com/story/14470773/ua-students-relieved-guns-on-campus-bill-vetoed#
I'm a professor in Idaho and I've debated this issue a little with my students. It's tough to do so most of the time because they are reluctant to talk about guns. You might as well be asking them how often they masturbate. But some will talk about guns. And the ones that do usually have the same two arguments against guns on campus:
1. They question why anyone needs a gun on campus. I say that a "need" for a weapon is irrelevant. It's my right. It's also a situation in which you DO have little use for it most of the time, but that is no reason to NOT keep one around. I don't need single malt scotch, or guitars, or beer, or cigars, but I always have them on-hand too.
2. They think guns on campus will be distracting. That they have a "right" to learn. They do not realize some students already carry. Been going on for some time I assume. The bottom line is they don't trust people sitting next to them. But they are all somehow OK with it outside the campus. The person in line behind them in the coffee shop could have a gun, and that somehow does not bother my students, but guns in class do.
I don't carry on campus. I check my gun with the police before walking onto campus. They are completely cool with it. Even had some good gun conversations with the local police. But I do go armed with a knife and pepper spray. It only takes one twitchy, nervous student sitting in the back of the class to make things uncomfortable.