I think the reason why the film is handled in this way is mainly to take care of the mainstream American values, just as why the protagonist has to say such a monologue at the end. This movie is about the struggle between criminals (including the male and female protagonists of course), and the killings in it must also be supported by certain reasons. This reason will not be a legal reason, but can only be supported by karma, basic moral bottom line and other reasons. And this reason cannot have much conflict with normal laws. In the story, the guy who betrayed the protagonist and abducted his wife, although he pokes his back and sells his friend and asks for glory (returning his second wife), he is legal in law and is a reasonable method for the judicial authorities to fight crimes. So if the story says that he was finally killed by the protagonist's design, it would be to retaliate against the witness, the (US) audience might be disgusted.
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