...and Gandalf suddenly had a brilliant idea of how to win the war.

[Kuruharan]

But if they were to use Orcs against Sauron and thereby redeem them, then that, I think, could be justified.

Huh? I’m a little confused. I thought that the whole point of using orcs was to let them be orcs, just on somebody else. That does not really seem like redeeming them.

So let's say the good guys have the facilities to tweak the orcs' genetics and make them nice little Eru-friendly creations that hate Sauron [and all the other evil guys]. After switching a few Ts with Cs, some As with Gs, Middle Earth has new quick-breeding ARMIES of good orcs.

It is difficult not to “get current” in answering a question like this because of the similarity to the cloning controversies of our own day, but in just trying to take a stab at it, I’d say that Eru would probably not appreciate it. Part of the fundamental nature of orcs is that they are chained to the will of another being. When Sauron went *poof* the orcs did as well. In order to make them good, their will would have to be chained to somebody else’s (read Gandalf). So the orcs would still be a race enslaved by their very nature, a perversion of life.