The vast majority of states and colleges prohibit guns from being carried on campus either by law or choice. However, in recent years the gun lobby has pushed legislation to force guns onto college campuses against the wishes of most students, staff, and campus law enforcement. There is no evidence that allowing guns on campuses reduces crime or makes campuses safer. In fact, campuses are already incredibly safe and adding guns to the mix only makes them less so.
Colleges are places of learning and students should be free to express their opinions and learn without the fear of another student carrying a gun to a lecture or at a tailgate. Colleges also have unique risk factors—increased rates of mental illness, and prevalent drug and alcohol abuse—which make the presence of guns potentially deadly.
— Everytown in Keep Guns Off Campus
[h/t Rob Romano]