I think it was a way to show that even the wisest (ie. Saruman) can be corrupted by the ring and as a way of makig sure that the Fellowship dont go through the gap of Rohan.
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Aw, you've done grand, laddie! Now you know what you have to do: Burn the house down. Burn 'em all! ~The Leprechaun from The Simpsons.
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