That's only active shooter events. There are other cases where armed civilians have stopped a crime. I don't have such data readily available, though.

Only an anecdote here: a guy I know claimed to have "defensively" used his gun. When I pressed him, it turned out that he drew his gun on a guy "that looked like a dirtbag" when he was staying at a motel.

From his point of view his life would have been threatened (he might not be alive today!) had he not presented his firearm.