Two men carrying guns deter robbery

Some are emphasizing this as a benefit from open carry. This shows that open carry can have some external benefits in that it protected others at the restaurant, though the external benefit isn't as large as that for concealed carry.

Two customers displaying holstered pistols deterred an armed robbery in a Kennesaw Wafflehouse recently.
There is some debate raging in Georgia about whether people should conceal their holstered handguns while in public. Some believe that wearing handguns openly will result in a loss of the element of surprise during a criminal attack, such as an armed robbery, while others believe that wearing handguns openly deters criminal attack. For Matt Brannan and J.P. Mitchell, who carry openly as a routine, the issue is no longer academic.
Matt Brannan and J.P. Mitchell were dining in the Wafflehouse on Barrett Parkway at I-575 in Kennesaw at 4:45 in the morning recently when a scout for an armed robbery crew entered the restaurant to case it. At the time, Matt and J.P. thought he looked a little suspicious, as he was wandering around the small restaurant like he was looking for someone. Unknown to Matt and J.P., two cars full of armed robbers where parked behind the restaurant waiting for the scout's report.
The scout saw that two of the customers were wearing holstered 1911 Springfield Mil-Spec .45 pistols, and he immediately turned and left the store.
Meanwhile, conscientious Cobb County Police Officer D. Lowe had noticed suspicious cars sitting behind the restaurant in the dark and decided to investigate. He caught men with masks and rifles who had been preparing to rob the Wafflehouse. The criminals informed the police that they had changed their mind upon discovering armed customers and were waiting for Matt and J.P. to leave. Ironically, the police car was pulling in to the parking lot just as Matt and J.P. were driving away. In other words, had Matt and J.P. not been armed, the robbery probably would have occurred before the police intervened. . . .