When Tolkien wrote that the wise amongst the elves held true that Orcs where corrupted elves, i think that he was saying that this was their best theory of how Orcs came into being but they could never know for sure as none of the Eldar had ever been to Untumno.
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For him that is pitiless, the deeds of pity are ever strange and beyond reckoning - of Melkor before his final downfall
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