This is actually not the case. Tolkien doesn't spend a whole lot of time on it (as is obvious from the way certain Stormfronters revere him, Tolkien was very bad at writing effective propaganda), but there are two different times when it is strongly suggested that the human nations following Sauron do so because they have been brainwashed by propaganda or misled by corrupt leaders, rather than because they are all evil to their very core. At the end of the Battle of Helm's Deep, Aragorn goes to the Dunlandings and basically says "you lose, we win, now gtfo back to Dunland" and the Dunlandings are all surprised because they expected to be executed en masse if they lost the battle, which suggests that Saruman has deceived them into fighting the war.FrankTrollman wrote:You won't find any particular nuance in Tolkien, the Dunlanders follow Sauron "because they are bad."OgreBattle wrote:That's part of where I'm coming from though, it's interesting for humans to fight humans. When I watched Lord of the Rings the Southrons and Easterlings really stood out, I wanted to find out more about why these humans marched alongside orcs under Sauron's banner.
Later on, after Faramir kills a couple of Haradrim, he wonders aloud whether or not he's a marauder who's in it for the plunder or a good person who's been duped into thinking Gondor is trying to take over the world and Mordor is the beleaguered kingdom barely holding them back. Faramir in the books isn't the grey character he was in the movies, either, he is very clearly virtuous in a way that is actually kind of dull. Movie Faramir is way more interesting.