he deserved all he got. and, even in the book version, if someone had killed him I would say this would not be against 'law' ('where such laws hold' of course as Gandalf states).
The main reasoning behind this is that the Parley was set up as part of the trap anyway.
Quote:
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He gave a great cry, and turned, leaped upon his steed, and with his company galloped madly back to Cirith Gorgor. But as they went his soldiers blew their horns in signal long arranged; and even before they came to the gate Sauron sprang his trap.
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You use a parley as part of a trap and you are under NO laws of protection.