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Once again I'll ask for that elusive practical answer: Would you have permitted the torture of one person if it would have prevented the Holocaust?
In what possible system of logic is that a "practical" question? How would you know the painful abuse of one person would prevent the Holocaust?
You keep proposing these wildly improbable hypotheticals. To paraphrase Inigo Montoya, you keep using this word "practical," and I do not think it means what you think it means.