FBI: Defensive gun use stops active shooters.
The FBI’s Conclusion:
Armed and unarmed citizens engaged the shooter in 10 incidents. They safely and successfully ended the shootings in eight of those incidents. Their selfless actions likely saved many lives.
And to further support an armed citizenry:
The enhanced threat posed by active shooters and the swiftness with which active shooter incidents unfold support the importance of preparation by law enforcement officers and citizens alike. (Emphasis added)
Source: The NC Renegade