When laws or rules go into place banning firearms from a given geographic area, they are based on the idea that the people who inhabit those areas cannot be trusted with carrying or owning firearms that the rest of the world is trusted with.
Banning firearms from college campuses suggest that we trust a 23 year old working on their masters less than a 23 year old who works in construction, or sales, or is even chronically unemployed. It means we trust a professor less than a manager of a construction company. That seems foolish to me. If our best and brightest are really being cultivated in our nations universities, then I think it's rational to allow them the same rights of people who choose to live or work in other places and quite honestly stupid to ban firearms on a university campus.