Well, yeah, but it would take a long time wouldn't it?
I suppose it has to do with how orcs reproduced. If sauron was somehow breeding them, i.e, their reproduction depended on sauron, they would all die out pretty quickly. on the other hand, if they reproduced independently, then every one would have to be killed until mordor was free of them, else they would just return.
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What it was could not be seen: it was like a great shadow...
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