Here is another (often hard to find because of media bias) example of someone being armed and using their weapon to defend themselves and not becoming a statistic.
From the AP: Sword-wielding robber killed at Vegas Dairy Queen
Published: Sunday, Aug. 19, 2012 – 4:36 pm
LAS VEGAS — Police say a clerk at a Las Vegas Dairy Queen shot and killed a sword-wielding, masked man who tried to rob the restaurant.
Detectives say the suspect was shot twice and was lying just outside the doors when officers arrived around 12:15 p.m. Sunday.
The suspect died at a hospital.
Metro Police Lt. Les Lane tells the Las Vegas-Journal the sword was at least three-feet long.
Authorities say the shooting appears to have been in self-defense but that detectives were investigating whether the gun used was properly registered.
They say only two employees and no customers were present at the time of the shooting.