I disagree with this. A military action per se is morally neutral. It’s an extreme measure, but it’s moral value depends on the goal you pursue and the methods you use. Although there are all kinds of gray areas, the basic premise of justified military action is that you are striking against an enemy which poses a credible threat. A torture victim poses no threat.
All contrived thought experiments aside, the purpose of torture is to destroy the victims’ integrity, dignity and identity, to uncivilize and dehumanize them. So how can you ever argue that torture is furthering the cause of human dignity? When you condone torture, you throw away both the dignity of the victim, and the dignity of the torturer, all in the name of some barely provable gain in security or order.
Maybe it’s clearer when you think of torture as a form of rape (which it often is).
Correct me if I’m wrong here, but I believe the western allies made it through the entirety of the second world war without having to officially condone torture, I would even say it was one of the defining characteristics of that alliance. This is what makes them the ‘good guys’, the rest is just dying empires struggling for a slice of the cake.
For me, one of the saddest things to come out of that war are the ways in which the nazi world-view infected the people who fought them. Case in point - Aussaresses - a French soldier (ex Légion d’Honneur) who was captured by the Germans in the early battles, later escaped, made it to the UK, dropped back in France to head a resistance cell etc. Now his claim to fame is that he (literally) wrote the book on counter-insurgency during the French-Algerian war, applying mass torture, kidnappings, death squads, ‘exemplary’ reprisals etc. He went on to serve as a counter-insurgency instructor to the US military throughout the Vietnam war, then moved on to Argentina during the dictatorship in the '70s etc. Maurice Papon who was much later convicted of crimes against humanity is another example.
Do I need to point out that the nazis lost, France was driven out of Algeria, the US was driven out of Vietnam, the Argentine dictatorship was overthrown etc? So, does torture work? Maybe as a very short-sighted instrument of social control, maybe occasionally a couple of the names a torture victim gives up actually were part of his cell, but ultimately it’s a betrayal of our values, makes us look weak and scared, and breeds future enemies.
ETA :
Why ? Do you actually think that a suicide bomber has any information that’s so useful that it justifies going over to the dark side in a desperate and clumsy attempt to extract it? What’s that act going to do to you?