I know GAF is pretty damn leftist, but how can anyone defend the assailant's actions/condemn the customer?
Guy goes into a populated restaurant, brandishing a firearm, demanding money. So it's an armed robbery. Then the perpetrator leaves, and a customer follows him out and calls out to the perp. Said perp then turns around, and brandishes the weapon again in a threatening manner and is shot down.
What isn't clear about this?
We really need to get out of this mentality of labeling things as left and right for opinions that should just be common sense for everyone. The bolded in your post is a risk this customer did not have to take. Once the robber left the facility, there was no need for this customer to use his gun and challenge someone with an AK-47. He and others should have only been concerned with calling the authorities and getting home safely. While the story mentions the customer was afraid for his wife, assuming the wife had a phone, he should have just called the wife and told her not to come to the Waffle House.