...that's an assumption, probably 20 years ago. Today's armed robbers, steal and then murder. The authors comment about crooks being "happy to just get the cash" is interesting....and if there wasn't enough cash, would they be "happy"?
The bigger story here is this: the media will never fail to run with a story where a firearm is used and the outcome is bad. "Man with gun holds family hostage"; "Gunman storms workplace, three dead" -- and on and on it goes.
However the media almost never run with a story where the outcome makes gun owners look good.
Somehow -- they need to be held to account for this -- letters to editors, whatever.