It is interesting to me that the thing did the crime and then walked back to its base and turned itself in. If it wasn't so sure that it would be subject to the American justice system perhaps it would have reconsidered its actions. Perhaps at least the possibility that crimes would be punished inside Afghanistan by the Afghans would have had a dissuasive effect.
(My comment assumes the killer isn't crazy to the point of hearing voices and hallucinating, nor that it didn't have a brain tumor or something that it had reported to authority.)
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