Jossverse demons and vampires don't just kill people for self-defense or ignorance or cultural difference, they do it for fun, because they get off on it. They still are in S8. Start focussing on them as representations of the other and the story as a coy allegory for some form of identity politics and all too soon you wind up implying that there's nothing wrong with representing black/gay/disabled people as literally (not allegedly) bloodthirsty demons.
I agree that Buffyverse demons shouldn't be read as that sort of allegory, because, yes, it's insulting. But at the same time I don't think that means they can't be read as personalities. There's always the not-talked-about-but-still-othered group: criminals. To kill, to enjoy killing, is not to make something irreconcilable with the human condition. And that is definitely a story still waiting to be told - I can remember my shock the first time Being Human dared to treat a paedophile like a real human being, and even allowed comparison between him and Mitchell. Because that's just not done.
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I agree that Buffyverse demons shouldn't be read as that sort of allegory, because, yes, it's insulting. But at the same time I don't think that means they can't be read as personalities. There's always the not-talked-about-but-still-othered group: criminals. To kill, to enjoy killing, is not to make something irreconcilable with the human condition. And that is definitely a story still waiting to be told - I can remember my shock the first time Being Human dared to treat a paedophile like a real human being, and even allowed comparison between him and Mitchell. Because that's just not done.