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[Tito]

Well, having in mind the time when the book was finished, we could also make a comparison between Middle Earth and the real world after the second world war.

In that way, Sauron, a kind of communist Big Brother having full control and information over its domains, is trying to take over the good old folks from the "free kingdoms" to the west. Luckily, this people get some help from agents of a continent far west into the ocean, and can finally defeat this menace and keep their "freedom".

I think Tolkien was pretty conservative himself, so this point of view is quite plausible.