The popular anti-torture argument that the victim say anything at all to please the torturer, is, as far as I can tell, the most perfect pro-torture argument possible.
I will explain, but first let me make an important distinction: For this very reason, I think torture should never be used to obtain a confession. Regimes that practice this kind of torture are despicable in the extreme, and deserve nothing but the enmity of the civilized world.
Further, information obtained by torture should never be admissible in court, for the same obvious reason.
However, torture to obtain information is different, and if it is true that the victim will say anything at all to please the torturer, then it is obvious that torture can be an effective and reliable tool for obtaining true information.
To begin with, if the torturer begins by asking for information that he already knows to be true from other sources, it quickly becomes evident that only the truth will make the torturer happy. Desperately inventing falsehoods will not serve. Only by desperately "inventing" the truth does the victim earn respite.
So far, so horrible. But a baseline has been established: We know that torture can be used to reliably obtain true information.
If the torturer then continues by asking for testable propositions, again the situation quickly becomes clear: Only by desperately inventing testable propositions can the victim earn respite.
A further--and necessary refinement--is to demand testable propositions that, when tested evaluate as true.
And there you have it: If the victim will say anything at all to please the torturer, then all the torturer has to do is make it clear that only testable propositions that evaluate to true will satisfy, for their torture to obtain truthful information. Q.E.D.
The rest is simply a matter of good judgement, restraint, and oversight in the application of torture. These are certainly problematic points, but no more so than the problems of government exercising good judgement, restraint and oversight in all the other matters of life and death for which we happily grant them authority over us.
If you're going to abolish torture over concerns about government restraint and judgement and oversight, you should probably abolish most other government functions as well.