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This is a matter of individual perception. Personally, I think of it this way: demons come from hell, a terrible place where pain, fear, hatred, suffering, bloodshed, torment, and punishment for sinners reign. That's my understanding. Therefore, I believe that the demons of Inferno, with their sadism, masochism, and madness, perfectly reflect the essence of hellish insanity. By the way, I like that this faction has such an effect on me; for the first time, Inferno at least slightly scares me (which is how it should be, in principle). But everyone perceives things differently.