If you read my comment carefully, I said "most" rational people.... not "all" rational people.  I agree with you, many rational thinking people can disagree on a variety of matters, like the two of us on this one.  However, its my sense that the majority of rational people would say that allowing guns in the campus classroom is a patently bad idea.  If we had a national referendum to allow guns on campuses, I'd predict voting citizens would handily vote it down.