Actually those things by virtue of the advancements they produced could be argued as being generally positive, even if they had negative aspects. Even though the Atomic Bomb was created with the intent to destroy, and its victims were horribly disfigured, vaporized, or died from poisoning, one could argue that it led to one of the more stable parts of the century. Pardon my twisted thinking, but a 1v1 with weapons whose true potential was completely unknown is way better than a 2v2v3v2v3v2v5v6v1v2. MAD? Economic push in wartime? You know that the States were at their economic height in the 60s and 70s, right? Furthermore, the absolute desire to surpass the other bloc led to extraordinary advances in all fields of science. These are good things with bad elements. Advancement is generally good.

Furthermore, Hitler was elected by the people of Germany. It seems that people decide to ignore this fact; TIME magazine, iirc, chose him as a Man of the Year in the 30s. He did do good things; he brought the people out of depression, solved many an economic problem, re-industrialized Germany for the future, and united the country which had more or less been split apart, quibbling and arguing over petty things. These were all good things, and are what leaders should have been expected to do. If Europe said no to all of Hitler's "I want this I want that" instead of appeasing him, Germany could have been stable for the next 70 years. Does that make what Hitler had done at that point done a bad thing? One should not confuse context with individual actions.

If you want to talk about horrible things, where's what the Communists did in China; the Great Leap Forward, "New Science"? Apparently whatever is the boldest is the most successful! Greater Eastern Asia Co-Prosperity Sphere? Hi Japan! So, let's talk about the Filipino-American War. Ever knew that existed? Ohh, how about modern atrocities? Wouldn't take much effort at all, and yet, a one-dimensional view of Hitler and Stalin having created ONLY evil must be true. Absolutely.