As we all know, crazy people with guns will obey the law

Georgia Gov. Nathan Deal vetoed a new law allowing licensed concealed carry on public college or university campus with this reasoning:

“From the early days of our nation and state, colleges have been treated as sanctuaries of learning where firearms have not been allowed. To depart from such time-honored protections should require overwhelming justification. I do not find that such justification exists.”

http://hotair.com/archives/2016/05/04/georgia-governor-vetoes-campus-carry-bill/

Yep. Places where “firearms have not been allowed” have not a record of unlawful gun owners shooting people. Crazy people illegally carrying guns or carrying illegal guns see those “No Firearms Allowed” and just shake their heads and go home, stymied from murder.