^ Note: We all don't live in the parts of the country where the police are three minutes away. People who live in the boonies realize that it will be half an hour, at best, before anyone arrives, and then another half hour before they figure out what approach to take.
ETA: And also, a pump action shotgun would've done just as much damage, if not more. Heck, based on old US Army tests, killing 26 people with an 1819 Hall flintlock
would've taken only 8 minutes 14 seconds, assuming that the assailant didn't just start bashing in skulls with the butt of his rifle.