Joseph, how do you know that there weren’t any Jews involved in that experiment?
Also, even if we knew who Amalek was, we would not carry out the mitzvah of killing them in modern times since Am Yisrael is not united. It is not a mitzvah for individual Jews to kill individual members of Amalek, but rather for the Jewish nation to exterminate the nation of Amalek. That’s not going to happen until Mashiach comes.
Re torturing terrorists, I’m all for it if it will serve the cause of getting information. However, my understanding of Abu Ghraib is that the terrorists were tortured unnecessarily, since we already had the information we needed.