Answer: This is what stops mass shootings.
Question: What is armed resistance?
David Hardy points to an article on the topic which shows a change in police tactics on the matter. It’s gone from calling in a SWAT team that would form a plan, like at Columbine, to 4-5 officers forming a diamond and roaming the hallways, like at Virginia Tech, to a lone officer confronting the gunman, which is what stopped the first major school shooting back in 1963.
Okay, so the Whitman incident didn’t just involve a single officer. There regular citizens keeping the guy’s head down with their own rifles (reminder: 1963, Texas) certainly helped and another regular civilian went up to confront Whitman in the tower. Whitman was unique in that he took up a nest in an elevated position whereas the regular school shooters these days just roam the hallways.
Shockingly, in every single incident, it ended when people started shooting at the bad guy. The quicker you start shooting them the better the outcome. Who knew?