Well said
Legate.
Besides the reasons mentioned by you, and others, I think you have to wonder about this:
Quote:
But even before this wickedness of Morgoth was suspected the Wise in the Elder Days taught always that the Orcs were not 'made' by Melkor, and therefore were not in their origin evil. They might have become irredeemable (at least by Elves and Men), but they remained within the Law.~HoME X; Morgoth's Ring
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Tolkien hints that by the standards of Elves and Men, orcs might have become "irredeemable," yet the Valar (and Eru) may see it differently. But I think you have to ask, how can Orcs become "redeemed" in a society (of Elves and Men) that believe, by their own standards, are irredeemable?