It's just a theroy but mabey since Sauron is only an eye, mabey his orders are misenterpreted. If they're using the Palantir to come in contact with him it's possible the orcs could've forgotton a part. I mean, they're not rocket scientist...
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'But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.'
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