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

[Kuruharan]

their Cause would have remained right. It does not follow that their chosen means of pursuing that Cause would have been right.

But that is just the thing that puzzles me. It seems to me that by employing or (especially in my view) breeding orcs, the West would be repudiating the very Cause they are trying to uphold.