"Cite your sources as to why torturing prisoners is wrong" is simply shorthand for "I actually like the idea of this torture and you can't tell me otherwise". Like I said, I can't make an argument as to why you should care about your fellow human if you don't already. It's not a good faith question.
We know that punitive measures do not act as a deterrence and in the case of more progressive countries that have wildly better outcomes we know what actually has good outcomes. If you're really interested all the literature is just a google away. Check out US incarceration and recidivism rates (which are the worst in the world) and those of more progressive countries. The data is all there for you, if you are curious. We've seen what doesn't work, and we've seen what does. It's not my job to educate you.
Like I said, I'm not here to convince you of anything. I cannot change your value system, I can only make a public example of why it does no good to drag us into the past, and all the atrocities that entails.
EDIT: sort of an afterthought, but for those reading I always find it hilarious that whenever a reactionary sees something work in another country the first instinct is to say "actually the US might exist in a bizarro reality where everything is opposite, and you can't prove that it's not so ha". As if the most scientific approach to seeing someone's repeated successful results is to absolutely refuse to try to replicate it yourself!