Brandon Sanderson
Susebron's Priests
Susebron is right to trust his priests. At least, he's somewhat right. They aren't evil men, and they do want what is best for him—as long as that doesn't include going against their traditions and rules. They believe they have the charge to protect Peacegiver's Treasure, and the God King holds that treasure. They do feel bad for what they are required to do to him.
Their interpretation is extreme, but what would you do, if your god (Peacegiver) commanded you that the Breaths be held and protected, but never used? Cutting out a man's tongue to keep him from using that terrible power is the way they decided to deal with it. Harsh, but effective.
Either way, they aren't planning to kill him. One of the big reversals I planned for this book from the concept stage was a world where the priests were good and the thieving crew was evil—a complete turnabout from Mistborn. Denth and his team were developed in my mind as an "anti-Kelsier's Crew." The priesthood, then, was to turn out to be maligned by the characters and actually working for their best interests.
In the end, I went with the evil crew idea, but the priests aren't 100% without their flaws.