What we've done.
Aside from the obvious moral evil which led us to this place, it's also important to remember the thinking which brought us there. The people "running" this war were never capable of distinguishing between the vision of the war they were selling to the country for propaganda purposes and the reality of what was happening. Even if torturing people to get "intelligence" was something which actually worked, the premise that such "intelligence" would actually help to solve the situation was based on the fantasy vision of what that problem was. They really believed that there were some evil masterminds with evil lairs - first former Baathists and then various "foreign fighters" - and if only they could find them and kill them then the problems would go away. There was an "enemy" which could somehow be vanquished, and once we did that the ponies would arrive.
This was a cartoon version of the war they tried to sell to the American public, but it was also what was driving their truly barbaric behavior.
