Instead of 4.4%, the correct number is at least 34.4%. In 2021, it is at least 49.1%. Excluding gun-free zones, it averaged over 50%. The shooting that killed three people and injured another at a Greenwood, Indiana, mall on July 17 drew broad national attention because of how it ended when 22-year-old Elisjsha Dicken, carrying a licensed handgun, fatally shot the attacker.
While Dicken was praised for his courage and skill squeezing off his first shot 15 seconds after the attack began, from a distance of 40 yards much of the immediate news coverage drew from FBI-approved statistics to assert that armed citizens almost never stop such attackers: Rare in US for an active shooter to be stopped by bystander (Associated Press); Rampage in Indiana a rare instance of armed civilian ending mass shooting (Washington Post); and After Indiana mall shooting, one hero but no lasting solution to gun violence (New York Times).
Evidence compiled by the Crime Prevention Research Center shows that the sources the media relied on undercounted the number of instances in which armed citizens have thwarted such attacks by an order of more than ten, saving untold numbers of lives. Of course, law-abiding citizens stopping these attacks are not rare. What is rare is national news coverage of those incidents. Although those many news stories about the Greenwood shooting also suggested that the defensive use of guns might endanger others, there is no evidence that these acts have harmed innocent victims.