A review of the data compiled by the FBI on mass shootings focused on incidents where an armed citizen intervened. In 283 cases documented over 18 years, an astonishingly low number of 33 featured a private citizen with a personal firearm.
While statistically too low to draw meaningful conclusions, the dramatic impact on the act of committing mass murder deserves recognition. In only 2 of those 33 reports was the armed citizen unable to affect the perpetrator (roughly 6 percent). In 25 of those crimes the man with a gun stopped the killer (over 75 percent of the time). More