Orcseys - always Evil?

[Raynor]

Originally Posted by alatar

Surely it had nothing to do with Tuor and Maeglin's desire for Idril

True, but this seems to come from a source mightier than Maeglin himself - the curse of Mandos:

Originally Posted by Of Maeglin, Silmarillion

And however that might be, Idril loved Maeglin not at all; and knowing his thought of her she loved him the less. For it seemed to her a thing strange and crooked in him, as indeed the Eldar ever since have deemed it: an evil fruit of the Kinslaying, whereby the shadow of the curse of Mandos fell upon the last hope of the Noldor.

So in the less strict sense, if an elf can work against Eru (or however you want to phrase it), and yet go west, why cannot the orcs, who, again assuming that they were taken and corrupted by Melkor?

If the orcs still have souls (and thus preserve their status as Children of Eru), then I believe you are right:

Originally Posted by Athrabeth Finrod ah Andreth

If we are indeed the Eruhin, the Children of the One, then He will not suffer Himself to be deprived of His own, not by any Enemy, not even by ourselves.