Left-wingers say torture is wrong because the victim will say whatever you want to hear.
Right-wingers say torture is right because the villain will tell the truth.
Q: What happens when you torture someone who only tells the truth?
A: They'll make noises in accordance with their personal trade-off between describing reality in clear language, and pain.
This is the whole of the Bayes-structure; the rest is commentary. Now go and study.