I hate to disagree with everyone so far, but I don't think that an orc could be non-evil, no matter how he was raised, unless someone of equal power to Morgoth were to spend generations upon generations trying to undo the work that Morgoth had done.
During the entire war of the ring, who was the only race that fought on the side of good that didn't fight on the side of evil (excepting Hobbits, who are an oddity)? The elves. The men fought on both sides, and the dwarves fought on both sides. And why was is that the elves only fought on one side? Because there is something inherrent to their being which causes evil to be abhorrent to them.
And, the orcs being a pervesion of the elves created by Morgoth, wouldn't it be considered possible that they may share the tendency to be predisposed towards a certain alignment.
Silmarillion:
Quote:
|
And deep in their dark hearts the Orcs loathed the Master whom they served in fear, the maker only of their misery.
|
It states in Sil that the orcs hated Morgoth, the "maker only of their misery." So, an inherent trait of orcs is their misery. They are miserable as a by-product of their very existance. And, hand-in-hand with this misery comes hate. As the nature of their being, they feel both misery and hate. I wouldn't be possible for a creature based on misery and hate to grow up to become good, no matter how well they were treated. Their inborn hate would fester and grow, until they were evil.