Juliette Kayyem, a former assistant secretary of homeland security, has an opinion piece in The Washington Post about how the mass shooting this week in Virginia Beach by a man armed with a handgun and a suppressor “sets an ominous precedent.”

And whenever we need perspective by a reporter who actually knows guns, we turn to The Free Beacon’s Stephen Gutowski, who thinks Kayyem might be overestimating the efficiency of a suppressor, or “silencer.”

In case that’s cropped or illegible:

Gun violence in America is unique not simply because of our culture but also because we have lawful weaponry that can kill many people very quickly. In terms of death-to-time ratio, single-shot weapons are preferable to multi-round handguns and handguns are preferable to the semiautomatic, and the favorite of mass shooters, the AR-15. It’s a simple calculation of time.

It’s a simple calculation of time, you see, based on the well-known death-to-time ratio.

Can’t demonize the AR-15 in this case, but you can, of course, blame the NRA for “selling” guns and suppressors to anyone who wants them at gun shows. You know, anybody can buy any weapon any time — without much if any regulation, they can buy it over the Internet, they can buy machine guns … according to Barack Obama.