Enemy of Progress
Now ponder something that comes through even the party-line demonization of a crushed enemy -- this clear-cut and undeniable fact: Sauron's army was the one that included every species and race on Middle Earth, including all the despised colors of humanity, and all the lower classes.
Hmm. Did they all leave their homes and march to war thinking, “Oh, goody, let's go serve an evil Dark Lord”?
Or might they instead have thought they were the “good guys,” with a justifiable grievance worth fighting for, rebelling against an ancient, rigid, pyramid-shaped, feudal hierarchy topped by invader-alien elfs and their Numenorean-colonialist human lackeys?
“Aragorn,” said Frodo, “are we… are we the baddies?” (Okay, I think I'm done now. Enough LOTR for a while.)