[Researchers] recruited 77 volunteers with varying levels of firearm experience and training, and had each of them participate in simulations of three different scenarios using the firearms training simulator at the Prince George’s County Police Department in Maryland…

They found that, perhaps unsurprisingly, people without firearms training performed poorly in the scenarios. They didn’t take cover. They didn’t attempt to issue commands to their assailants. Their trigger fingers were either too itchy — they shot innocent bystanders or unarmed people, or not itchy enough — they didn’t shoot armed assailants until they were already being shot at