In his works, Tolkien was deliberately trying to create a mythology for England, so he intentionally set his tales in a land reminiscent of northern Europe, featuring Caucasian humans. And although the non-European humans get short schrift in LOTR, he does make a point of showing in the Silmarillion that they are not all evil; several Easterling tribes (Bor and his sons) become allies of the elves. But I can certainly see why some readers (in our more PC times) might be uncomfortable with his work.
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And thus it came to pass that the Silmarils found their long homes: one in the airs of heaven, and one in the fires of the heart of the world, and one in the deep waters.
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