One of the differences between moderate advocates of gun control and prohibitionists is in their attitudes toward self-defense. The former are willing to recognize that defensive arms in the right hands can be socially beneficial. The latter deny that firearms do in fact save lives. A good example is Katie Couric’s new TV special “Under the Gun.” In that program, Matt Lauer states: “There is a very common expression out there that ‘The only way to stop a bad guy with a gun is to have a good guy with a gun.’ ” Couric answers, “Most public health experts and gun safety experts say that it is just a specious argument.”

The unnamed “experts” on whom Couric relies are apparently not expert at reading newspapers. Literally, a good guy with a gun is not the “only” way that armed criminals are stopped. But it is an important way, including in mass shootings.

Now, Ronald K. Noble, former secretary-general of Interpol, is weighing in on the issue. During the first Clinton administration, from 1993 to 1996, Noble served as assistant secretary and then undersecretary for enforcement at the Treasury Department. This made him the direct supervisor of the main federal gun control agency, the Bureau of Alcohol, Tobacco and Firearms. As such, he played a major role in the Clinton administration’s very aggressive gun control program. This included changing BATF licensing practices for Federal Firearms Licensees to deny the majority of them license renewal.

As Noble explains, his 14 years of close involvement in global counterterrorism changed his perspective on gun control. This week, he has published a video about the 2013 mass shootings at the Westgate Mall in Nairobi. The video, “Armed Citizens Can Help Stop Terrorist Massacres Like Nairobi and Paris,” shows graphic footage of the attack and of the response of armed citizens. During the lengthy and well-planned attack, more than 60 innocent people were murdered. As Noble explains, the death count would have been hundreds more if not for the armed citizens who intervened. As Noble puts it, “This is not an American argument, nor a political argument. In these horrific situations, law-abiding armed citizens have helped protect others and literally saved lives, and the world should be made aware of this reality. . . . In the hands of law-abiding citizens, guns can and do save lives.”