Well, I think there was a possibility that they weren't elves at all. If they were, they would've been immortal, and when their body destroyed, would have gone to the Halls of Mandos. But if they were, then I believe they were created by magic. For if somebody cuts the arm from your father, when you are born, you will probably still have two arms. Genemanipulation(hope I spelled it right, not very familiar word for me) would be a choise, but very unlikely. After all, Middle-earth is a fantasy world. Why they became evil, well.. Spend several hundred years tortured, I don't think you are very happy or nice. "Hello guys, I'm back from Utumno!" And after that they feared Melkor too much to be anything else.
But I believe they were something else, not elves at all.
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"Out of doubt, out of dark to the day's rising I came singing in the sun, sword unsheathing. To hope's end I rode and to heart's breaking: Now for wrath, now for ruin and a red nightfall!"
~Eomer
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