From the piece:
The National Rifle Association and its allies would have us believe that the solution to this epidemic, itself but a sliver of America's overall gun violence, is to put firearms in the hands of as many citizens as possible. "The only thing that stops a bad guy with a gun is a good guy with a gun," declared the NRA's Wayne LaPierre in a press conference a week after Newtown, the same day bells tolled at the National Cathedral and the devastated town mourned its 28 dead. (That day a gunman in Pennsylvania also murdered three people and wounded a state trooper shortly before LaPierre gave his remarks.) LaPierre explained that it was a travesty for a school principal to face evil unarmed, and he called for gun-wielding security officers to be deployed in every school in America.
As many commentators noted, it was particularly callous of the NRA to double down on its long-standing proposal to fight gun violence with more guns while parents in Newtown were burying their first graders. But more importantly, the NRA's argument is bereft of supporting evidence. A closer look reveals that their case for arming Americans against mass shooters is nothing more than a cynical ideological talking point—one dressed up in appeals to heroism and the defense of constitutional freedom, and wholly reliant on misdirection and half truths. If only Sandy Hook's principal had been packing heat, the argument goes, she could've stopped the mass killer. There's just one little problem with this: Not a single one of the 62 mass shootings we studied in our investigation has been stopped this way—even asthe nation has been flooded with millions of additional firearms and a barrage of recent laws has made it easier than ever for ordinary citizens to carry them in public places, including bars, parks, and schools.