Those of us who try to convince liberals of the folly of gun control often point to the fact that, in an imperfect world, it would be impossible to confiscate every weapon from every individual. Consequently, any gun control efforts end up punishing the law-abiding while leaving the criminals armed and better able to prey upon the innocent. We also point to the inevitable slippery-slope, full well knowing that’s what may of these would-be tyrants are counting on. Sure, they’re going after the so-called “assault rifles” now, because the Parkland shooter used one and they’re really scary looking, but does...