Noah probably doesn’t know it, but he just accidentally made an airtight case against gun-free zones in particular and gun control in general. He is 100 percent correct: people hell-bent on murdering as many people as possible don’t really care about silly signs or laws that tell them not to murder people. A sign that says “No Guns” will no more keep a violent jihadi from gunning down a bunch of innocent people than will a sign that says “Muslims Get Out.” And how do we know that gun-free zones, nearly always marked with signs designating them as such, don’t deter murderous psychopaths? Because mass shootings, rather than happening at gun ranges or in gun stores, keep happening in gun-free zones.

Contrary to Trevor Noah’s snarky assertion that “we’ve never tried to repel terrorists with signs,” our country has fecklessly tried for years to “repel terrorists with signs.”

The Sandy Hook massacre? Gun-free zone. Columbine? Gun-free zone. The Aurora movie theater shooting? Gun-free zone. The shooting last year at an Oregon community college? Gun-free zone. The shooting at a movie theater in Lafayette? Gun-free zone. The attack on a military recruiting center in Chattanooga? Gun-free zone. The Ft. Hood shooting? You guessed it: gun-free zone. The San Bernardino attack? Gun-free zone. And the massacre perpetrated by an ISIS enthusiast at an Orlando night club? Gun-free zone.