On December 21, 2012, NRA Executive Vice President Wayne LaPierre said “The only way to stop a bad guy with a gun is with a good guy with a gun.” On June 5, 2014, a bad guy with a gun was stopped by bystanders, one wielding pepper spray.

The police and military are “good guys with guns” tasked with stopping “bad guys with guns.” But LaPierre’s statement is a rallying cry for a “good guy vigilantism” of sorts. It advocates for relaxed gun control laws, in part so that more people could conceivably stop a rampage killing.

I created GoodGuyWithAGun.net as list of how mass shootings in the United States since 1999 have ended. It defines a “good guy with a gun” as a civilian or off-duty officer. Enjoy.