From a 1945 article in the Army newspaper "Stars And Stripes", instructing the American soldiers on how to react to the German civilians they were in constant contact with, as the occupying forces:
"Don't get chummy with Jerry (slang for Germans). In heart, body and soul every single German is Hitler. Don't make friends with Hitler. Don't fraternize. If in a town you even one time bow or hold a door open for an elderly woman or a pretty young girl, or if you pet a small blonde boy on the head: You bow to Hitler and his demonic reign of blood."
In a further article is an interview with Roosevelt's Secretary of The Treasury, Henry Morgenthau, Junior:
"The only way to keep Germany under control is to level its factories, destroy its mines and make the country forever nothing more than a peasant/pastoral state. The leaders of this country are to be hanged as soon as possible, and the people who survive the starvation rations that we should impose upon the nation should be reduced to a state of being swineherds, garbage collectors, and sharecroppers who barely make subsistence living. I am also talking with the President about the possibility of enforced sterilization. If this last procedure is enacted, then within a short period of time the entire German race will be eliminated and the world will no longer have to fear this aberrant and genetically diseased people who are a danger to the rest of humanity."
Thankfully Roosevelt and other world leaders decided against deliberately starving the German people and sterilizing everyone. I don't think that Morgenthau ever apologized for what he said (and he said these things in official interviews and papers repeatedly) nor did he ever seem to realize the hypocrisy of what he wanted enacted.
Of course, not all of the American soldiers and politicians felt this way, but it is an attitude that is almost always glossed over and completely ignored in the history books and documentaries, so much so that most people now have no idea that these things were actually written and discussed by the Allies.