Well in this case the problem was that he followed the perp out to the parking lot. If he’d shot the perp in the act that would have been more defensible. Fortunately the cops were sympathetic to his situation and accepted his claim that he was afraid for his wife’s safety even though she was not present because she was on her way over. Who knows whether there was any truth to it. The cops are just about the only authorities who you can count on to act reasonably these days. They threw him a lifeline.
The customer claims the perp pointed his "AK-47" at him -- immediately after the perp had committed a felony. That is direct self-defense ... the wife part of the story is irrelevant.
I agree.
the good guy requested all the money back
the shot guy then in a threatening gesture pointed the rifle at him
the good guy operating in self defense mode, shot him