Yes, you're right, if someone waterboarded me to tell me where their GI Joe toy was hidden then I would certainly tell them.
But the analogy doesn't work on adults when concerning matter they consider so important they it would take more than a pink belly, and I'm guessing rarely can the information revealed from torture be instantly verified. Oh, also they have training to desensitize them from torture, so if they think they can tell a lie just to get them off the hook for a while, then they might just do that too. So yeah good luck on getting a real person to tell you where his real life GI Joe buddies are hidden.