The proper origin of Orcs has been much discussed over time. To be fair, the idea in the Silmarillion that they were 'ruined' Elves is really only the best guess of the Eldar. They didn't know for sure.
As for the movie, and I certainly don't want to start a debate over it here, I wouldn't consider anything said or done there to be canonical. As it's been pointed out to me, the movies are merely an interpretation of the books and should be thought of in that light.
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Music alone proves the existence of God.
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