I'm not entirely sure what you're arguing exactly, but by the same reasoning I could conclude that to Adolf Hitler, the Jews and the Allies were Demons and that the Nazis were Angels. I would hold that Hitler's perspective on himself is irrelevant by virtue of the people he harmed, and that the same holds true for Epic despots like Steelheart or Regalia.
Yes! Now you're getting it. While it may be sick and twisted, Hitler saw the Jews as a blemish, and he was the savior to wipe them off the face of the earth, doing humanity a favor. It WASNT right at all, but that's what the Nazis saw. Again, it's like the Epics.