JRRT speculates (apparently negatively in Letters) on the
redemption from evil of orcs, but even if so, there are problems.
In several places there are typical Tolkien half-allusions and/or
hints of orc/humans.
1) In LOTR Frodo says about the Dunlending in Bill Ferny's home:
Quote:
He looks more than half like a goblin
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2) In UT in "The Hunt For The Ring"
Quote:
Some while ago one of Saruman's most trusted ervants (yet
a ruffianly fellow, an outlaw driven from Dunland, where many said
that he had Orc-blood
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Further,
if you assume the theory that orcs are elvish in origin,
then these "half-orcs" are both part elvish and part mannish (human)
and so, even
if orcs are unredeemable (from the dark side?

)
what of these partial orc/elf/man creatures?
And, (by the by) what does it say of Dunlending society's complexity?
They were driven from Rohan and have a respectable grudge with
the Rohirrim, and apparently don't even like, in
principle, even half-orcsees.