You're damned right they do

A gun-carrying grandmother in Milwaukee foiled an attempted robbery when she pulled a firearm on the suspect as he grabbed for her grocery store cash register.

Ernestine Aldana, 48, was behind the counter at the San Ignacio Market when a man in a dark hat pulled a knife on her and attempted to rob the store register, police said. Aldana pulled a handgun from behind the counter on the man, causing him to flee.

Good for her.

And I absolutely LOVE this line:

“If I didn’t have the gun there, he would have hurt me, once I had the gun there it changed everything,”

Yep.  And that's the whole damn point.  Good for her.