Y'know, given that the US was the agressor in the conflict [nothing wrong with that, just plain fact], you could argue that the entire body-count for the war is on their hands, and that beats two tortured soldiers by... what, several thousand? But then, who's keeping score, eh?
Plus, it's worth noting that these were soldiers, they knew the risk and were trained to avoid it where possible. Obviously it didn't help here, but the risk comes with the territory. Torture against civilians that may well be completely innocent is somewhat more sinister than torture of enemy combatants killing your countrymen.