I don't know about that one. When Zig mentioned Guy Fawkes, it got me curious enough to read up on it. This is, they got the names of a number of "conspirators" from torturing him, who were given show trials and all executed at the same time. It's likely (from a spied-upon conversation) that at least one of the names was a real conspirator, but they weren't exactly trying to weed out false positives there or anything. We can see from Salem a few years later that actual crimes, knowledge, or plain facts aren't necessarily involved in such coerced implications.
To use people's PIN hypothetical from upthread, yes, it's quite likely that someone can be tortured into giving up their real pin number, after a few false ones, of course. But the thing is, if you happen to incorrectly input the PIN, and you go back and say it isn't working and torture them some more, they'll still give you more numbers to make it stop, and you'll have no way of knowing that the truth passed you by entirely.
That's the thing that the "torture doesn't work" people are getting at. What makes or breaks a tool of intelligence isn't whether or not it ever signals a true positive (if that's all you care about, flip a damned coin, it's right half the time) but that it provides a level of accuracy (minimizing false negatives AND false positives) which makes it worth bothering with. I don't think anyone would deny that torture is a ridiculously inaccurate method of gathering information, which is why all the hypotheticals we've been discussing in this thread are things we can test right away, like PIN numbers or bomb locations. The only times that torture accurately provides information is when you already know the right answer and can discard false positives, or you don't much care what the answer is and can accept false positives, or you're just doing it to be sadistic.
That is why it doesn't work: because it only "works" when you don't need it to work.