It seems to me that as time went on he wanted the existence of Orcs to be more consistent with his own beliefs and how they were manifested in the spiritual-metaphysical systems of Arda, hence his later musing on the subject.
Yet I actually find it a little curious that he found the question difficult, because it seems to me that he saw the "Orc-level of mind and habits", or something close to it, present in modern society. I would have thought that, by his world-view, "Orcishness" was very evidently a state to which any being could be reduced, and that such a quality might well become endemic in a population under tyranny, oppression, denial of spiritual truth etc.
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"Since the evening of that day we have journeyed from the shadow of Tol Brandir."
"On foot?" cried Éomer.
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