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Is it possible for you to construct a scenario where torture is morally acceptable?Yes, it's possible to concoct a fictional scenario whereby torturing one person saves millions of lives. Heck, why not a more plausible scenario where torturing someone saves 2 lives. But it's a non-sequitur: a true statement that is irrelevant.
I won't argue this well, especially not well enough to convince someone for whom "torture" is acceptable, but principles matter. It's the only thing that separates the good guys from the bad guys. Not guns, not good looks, not firm jaws, not money, not power, not magical spells. Bad and good people have, or don't have, those things in equal measure.
Torture = bad guy. Beating people in the street = bad guy. Planting evidence on a suspect = bad guy. Stealing elections = bad guy.
This is important because, while some of those things might be expedient to get your desired outcome, it makes society worse. If you do that, you are the bad guy. Maybe the other guy is bad too, but you definitely are. Now when other people do it, you can't say shit. You did it. You could not come up with a better way. Society is now worse and more dangerous because of you. All the bad guys have reasons for doing bad things, but only good guys do the good things, even when it's not easy. Good people say "times are extraordinarily dangerous, so now more than ever we must fight to maintain our integrity and our values, and treat our opponents with due process and dignity, no matter how much we despise them"
We now have a society where torture is considered awful, but that is hard won. Not long ago, we would burn people alive publicly as punishment for Very Serious reasons. When we start saying "torture is ok now because these times are extraordinarily dangerous", then torture is a bit more acceptable when times are not so dangerous.
That's it. That's the argument.