Except armed people stop killings and other violence all the time.
Maybe you could cite a few of those cases for the authors of this article.
The NRA Myth of Arming the Good Guys
Mass shootings in the US are on the riseâ"and ordinary citizens with guns don't stop them.
By Mark Follman
Dec. 28, 2012
If only Sandy Hook's principal had been packing heat, the argument goes, she could've stopped the mass killer. There's just one little problem with this: Not a single one of the 62 mass shootings we studied in our investigation has been stopped this way--even as the nation has been flooded with millions of additional firearms and a barrage of recent laws has made it easier than ever for ordinary citizens to carry them in public places, including bars, parks, and schools.
Attempts by armed citizens to stop shooters are rare. At least two such attempts in recent years ended badly, with the would-be good guys gravely wounded or killed. Meanwhile, the five cases most commonly cited as instances of regular folks stopping massacres fall apart under scrutiny: Either they didn't involve ordinary citizens taking action--those who intervened were actually cops, trained security officers, or military personnel--or the citizens took action after the shooting rampages appeared to have already ended. (Or in some cases, both.)
Gun rights die-hards claim the Portland mall shooter saw an armed good guy--who ran for cover instead of firing--and promptly shot himself dead. Obviously.