Frankly, I don't see the connection. The acts of individuals in the fog of war is to be considered a national policy, or reflective of the beliefs of the population at large?
I don't think so.
Further, the question is a syllogism. America, and Americans, don't consider themselves "the moral compass for the world at large." As a Nation we do our best to muddle through.
The record is pretty good, though. We defeated Germany in 1918, and gave France back to France (and made Czechoslovakia, Poland, Yugoslavia, et. al., possible). In WWII, we conquered Italy, and gave it to the Italians. We conquered Germany, and gave it to the Germans. We conquered Japan, and gave it to the Japanese. We defended Korea, and saved half of it from becoming Kim Il Sung's personal playground. We defeated the Communists of North Vietnam, and gave Vietnam to the Vietnamese. Alas, the "moral cowards" in the US Congress in 1975 refused the means to help the Vietnamese again repel (as they did in 1972) invading armies from the North.
America has given much of its blood and treasure; as one commentator put it, the only ground we ask for is enough to bury our dead.
Respectfully,
Walt