The problem with that kind of reasoning is that it assigns a quantitative value to life. I don't think you can subject human life to this kind of mathematical r

The problem with that kind of reasoning is that it assigns a quantitative value to life. I don't think you can subject human life to this kind of mathematical reasoning: we'll sacrifice two lives to save three, or twenty to save five hundred. This kind of calculation is utilitarian economics, not ethics. Ethical reasoning tells us that certain categories of action are intrinsically wrong, regardless of context, and that whatever immediate benefit accrues from them, they will taint and corrupt the individual and the society that perpetrates them. Torture indisputably falls within this category.