Well, torture victims have been known to give false confessions to stop the pain - but I believe that those instances were mainly when the persons were subjected to extreme physical abuse.
They just tell you any old b*****cks. Whatever they think you want to hear. the only possible good this could do is if you were abstractedly interested in what people thought you wanted to hear.
I should also repeat that it isn't just first hand stuff, or even every single first hand professional I've ever met and discussed it with*. It's also in page after page of history.
* Amateurs discuss tactics. Professionals discuss logistics. Old soldiers discuss toilets facilities. Weirdos discuss torture.
If they lie torture them again and threaten something besides themselves. No, thats the point were it turns from acceptable to wrong, but still, what are you to do to extract the intel you need?
Yes, this is NOT a moral discussion. I've had quite enough of that.