That's so stupid. The gun and area would only show signs of a single bullet being shot meaning that any half-ass investigation would prove this man innocent.
And the idiot thinks that begging will work instead of say, demonstrating with something small like a paper clip? And the author thinks you'll get executed for clear self defense against a mugging even if, as others have pointed out, the investigation did not unearth the clear and obvious inconsistencies?
Further yet, what if it got so bad all humans were wiped out. What would happen if THEN he got hurt?
And how he said that at the end sadly. I would definitely had an evil grin.