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because in the book it's never really acknowledged who causes gandalf to go through the mines. if anything, it's Sauron who's 'arm has grown long' not Saurman. As i've said before, jackson needed a 'baddie' to focus on in these films - A giant red eye is not enough, so he uses the witch king in some areas (I can't wait until we get to that scene, although all it will need is some cutting and pasting from the gandalf v witchking thread....) and Saruman in others to replace the 'spirit' of Sauron
therefore we have a direct reason in the film that movie goers can see that Saruman is forcing Gandalf into going into Moria. Movie Gandalf seems to know this too, and therefore tries to stop it - but in the end he seems resigned to it once the watcher in the water pulls down the walls and therefore seals his fate..........
that's my 2 cents anyway
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