We'd be less likely to use interrogation methods that went too far if the officer in charge was subjected to the same methods concurrently. Then the officer would be in the correct position to judge what was reasonable and what was not. Like Jubal was talking about on Firefly.

Jubal Early: You oughta be shot. Or stabbed, lose a leg. To be a surgeon, you know? Know what kind of pain you're dealing with. They make psychiatrists get psychoanalyzed before they can get certified, but they don't make a surgeon get cut on. That seem right to you?