I'm always (and yesterday evening again) ethically confused by movies and series episodes in which the hero(s) kill(s) dozens of little fish gangsters, shooting everyone in her (their) path towards the really bad villain and then, in a dramatic final scene, decide(s) not to kill the really bad villain but arrest him and bring him to trial.
Is there a name for and maybe studies about that weird ethically concept in movies?
It confuses me that quite often it appears to be moral consensus among script writers and directors to kill a lot of small fish that were maybe forced to become gangsters to feed their families and then show the goodness of the hero by not killing but arresting the only person in the movie who would actually deserve to be killed.