As for people exercising their right to carry weapons on campus, here are some I have dealt with:
Wife carried her concealed handgun onto campus to kill husband because he filed for divorce.
Student from another college carried concealed handguns onto campus to "get even" with some of our students for something that happened off campus at a bar.
I have personally arrested four DUI's and six intoxicated passengers that were carrying concealed handguns.
Oh how about the 10 to 12 loaded handguns we have found laying in the seats of unoccupied cars.....right next to the marijuana pipes.
Exactly. Laws against those exact scenarios would have obviously prevented them from occurring. Oh wait...