Wayne LaPierre, the NRA honcho, likes to spout this lame aphorism every chance he gets:

"The only thing that can stop a bad guy with a gun is a good guy with a gun"

Au contraire, Monsieur LaPierre:

Meis, who was working at the time as a monitor who sits at a desk in the lobby, near the Hall’s front door, quickly moved in to pepper-spray the gunman, then he tackled him to the ground. Police arriving moments later moved in to handcuff and arrest the suspect, other witnesses said.