Two factors explain this discrepancy – one, misclassified shootings; and two, overlooked incidents. Regarding the former, the CPRC determined that the FBI reports had misclassified five shootings: In two incidents, the Bureau notes in its detailed write-up that citizens possessing valid firearms permits confronted the shooters and caused them to flee the scene. However, the FBI did not list these cases as being stopped by armed citizens because police later apprehended the attackers. In two other incidents, the FBI misidentified armed civilians as armed security personnel. Finally, the FBI failed to mention citizen engagement in one incident.
Never let your government disarm you. They dont have your interests at heart.
That “separate category” being “having an ounce of documented context beyond random gunfire” or “suspects being suspected criminals in other ways”. Look at the provided documentation on “active shooter incidents”, it’s a category defined only by lack of known context, usually because they die at the end preventing a court case and additional charges. They have denied “active shooter” classification on the basis of "Was the result of an altercation. (The shooter got into an argument with someone then fired indiscriminately into the crowd.) " This means an “active shooter incident” doesn’t include shooting at police, shooting bystanders in laundromats, random drive-bys, parking lot shootings, redux, or shootings in lounges.
“Active shooters” being defined only by what we don’t know rather than “a person actively shooting” is pure dishonesty.