There is not a single campus where the failure to ban lawfully-possessed concealed guns caused a mass shooting.

In fact, almost all places where mass shootings have taken place are “gun-free zones.”

The results are predictable, as I explained in my viral column at USA Today, Time to talk about gun free zones:

In almost all mass shooting situations, particularly at schools, the common theme is a gun-free zone, with the shooter being the only one armed person in the building for minutes or longer. And in each case, the shooter couldn’t care less about the gun-free nature of the building, and if anything, was drawn to such a location.

Gun-free zones presume the good intentions of those entering the zone. And the overwhelming majority have such good intentions. But for those who have bad intentions, gun-free zones turn schools and other locations into shooting galleries. The good people are unarmed, the evil person is armed.

So, to double down on a stupid policy that does nothing to stop criminals, California Governor Jerry Brown just signed legislation banning concealed weapons on all California campuses, as reported by the L.A. Times:

A week after a gunman killed nine people at an Oregon college, California Gov. Jerry Brown signed legislation Saturday that will ban the carrying of concealed guns on school and university campuses in this state.

Sen. Lois Wolk (D-Davis) said the bill she introduced several months ago is needed to close a loophole that allows people with concealed-weapons permits to carry firearms onto school grounds. The bill prohibits that practice, unless school officials grant permission or the carrier is retired from law enforcement.

The bill is supported by Peggy McCrum, president of the California Chapters of the Brady Campaign to Prevent Gun Violence.

“California’s college campuses and K-12 schools should be sanctuaries for learning, free from the fear of gun violence,” McCrum said, adding the new law “will make schools safer and decrease students’ risk of being injured or killed.”

Let’s put it another way. California has just made campuses prime targets for criminal shooters, who alone will be armed. Not just vulneralbe to the mass shooters — but common criminals and gang-bangers as well.

It has left otherwise law-abiding students and faculty sitting ducks for people who don’t give a damn about your laws and rules.