A new detail in the Florida shooting exposes a big hole in the good guy with a gun theory.

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This is more than just another horrific detail about the mass shooting that killed 17 people; it also directly contradicts the notion that simply putting a bunch of armed personnel in schools will stop shooters — the “good guy with a gun” theory.

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The latest revelations about the officer’s failure to act in the Florida shooting are a devastating example of this theory not working as planned. But the evidence suggests this shouldn’t be too surprising. Even when people are armed, they often fail to properly respond to a mass shooting.

Stopping a mass shooting is hard, even with firearm training

Multiple simulations have demonstrated that most people, if placed in an active shooter situation while armed, will not be able to stop the situation, and may in fact do little more than get themselves killed in the process.

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The Daily Show also put this theory to the test in another — more comedic — simulation segment. Jordan Klepper, who was a correspondent with the show at the time, trained on the basics of using a firearm and got a concealed carry permit that was valid in 30 states. Then he participated in mass shooting simulations to see how he would hold up in such a scenario.

He failed — miserably. In his final test, which simulated a school shooting, he shot an unarmed civilian, and he was shot multiple times by the active shooters and even law enforcement, who mistook him for the bad guy. He never took down the active shooters.

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