I remember reading up about an argument, but I can't recall or find what it was called.
It basically boiled down to this - because in either our real history or the history of a given fictional world certain atrocities were more common or were committed by the authorities in the name of the law (such as maiming, slavery, torture, racial slurs, etc.), the characters in the fiction are justified in doing these things or even seen as good people, even if to the modern sensibilities those are atrocities?