If you're concerned about the normalization of something, wouldn't the numerous murders and killings in self-defense be more troubling than a handful of episodes featuring serial-killers/amoral corporate types/amoral scientists ignoring the plight of their victims?
And the relevance of that? Its presence in the show (by aychedee's logic) is still resulting in its normalization. If it's bad to normalize torture, it's at least as bad to normalize murder and generalized violence.
