"Why did the movies turn Saruman into Sauron's toady?"
Because here, as in some many other things, Jackson severely underestimates (that's the nice word) the intelligence of the audience. He (or Philippa) actually says as much in an interview, that they didn't think the audience could handle the "added complication" of Saruman as a freelancer rather than a minion.
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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