For one thing, 911 calls are supposed to be limited to "emergencies". 4 or 5 guys sitting in a restaurant in Virginia, or anyplace else where it's legal to carry a gun, openly or concealed, are not indicative of an "emergency". Now, to be fair, I don't recall if that particular case was called into 911 or just the local authorities number. Where I live, we are covered by the county sheriffs office, acting as our police force. I carry their number on my cell phone as a "quick call" button.
911 should not be used unless the person with the gun is acting in a wierd, aggressive, or threatening way. It definitely should not be used in the case of 4 or 5 guys enjoying a burger in a restaurant while otherwise minding their own business.
If I see some guy walking through my cul-de-sac with a shootin' iron strapped onto his hip, but the gun is in the holster and he appears to be out for a walk, I'd probably wave and say, "Nice evening for a walk".
However, if I see some guy walking through my cul-de-sac with a shootin' iron in hand, and acting a little bit out of the ordinary, I'd call the local sheriff's office and let them know what I'm observing. I might also get in my house if I'm outside and observe what's happening.
"If you love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you and may posterity forget that ye were our countrymen." Samuel Adams.