The very nature of evil dictates that you use any means to achieve your ends. Lying is just part of the job, along with diguising yourself in false colors, betraying your allies if it will advance your own cause, distrusting the motives of everyone around you, and sending your troops out to fight impossible battles, without regard for losses. (Because you can always pay or enslave more troops if needed.)
"Good Guys" have certain behaviors and rules they must follow, such as not killing without need, benefit of the doubt, "The Golden Rule", etc. If they don't follow these rules, then they become the very thing they are fighting.
Maybe Gandalf had his suspicions, but he would not bring these to light without proof. Saruman would have, in his meglomania, just assumed the worst and made up any "proofs" to back up his assumptions.
OK, maybe that's kind of a "black and white" way of looking at things, but that's the kind of attitude you have to take when battling Evil Incarnate.
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