Ran across this article posted on another board I frequent and wanted to share. The article looks at the effect of armed civilians when present at active shooter events.
https://www.concealedcarry.com/news...-95-of-the-time-at-active-shooter-events-fbi/
https://www.concealedcarry.com/news...-95-of-the-time-at-active-shooter-events-fbi/