They fear that it would make firearm accidents more likely, and in the event that a robber or a mass shooter is on the loose, there would be a chaotic hail of gunfire from all directions.

It's a silly argument to make, considering that even in states where there are loose gun laws, and where it is easy to obtain a concealed carry permit, only a minority of citizens carry guns at all times. But for the sake of argument, what would happen if everyone was armed in the vicinity of a violent criminal?

Perhaps this footage of a liquor store robbery in Brazil can answer that question. It shows what happens when a robber tries to hold up a store where every customer is packing heat.

The footage, which was originally posted on Liveleak, is dated May 31st, 2017. The gunman enters the store with a motorcycle helmet to conceal his face, but appears to drop his weapon after he walks past one of the customers. Then he is shot after every customer draws a gun on him.