I think that free will and prophecies/curses are separate entities in Middle-earth. While obviously the House of Hurin was cursed, it was not the curse that wrought Turin and Hurin's destiny, I believe, but the fact that all their actions were based on the knowledge that this curse existed. I think that the curse itself did not alter their destinies, but that through the lies of Morgoth and of Glaurung, and through their own actions which they took in efforts to avoid or put off the curse, their doom was wrought for them.
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...where the instrument of intelligence is added to brute power and evil will, mankind is powerless in its own defence.
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