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Hitler was evil.Evil is a religious idea. Hitler was a man, not some devil.
Those kind of after-the-fact statements are just cargo-cult that tend to obscure real historical understanding. Even if one means it well ("if we all repugned by such evil, we will avoid it") it doesn't work that way in actual life, for it tends to stick to some people and events and ignore others.
One has to understand "evil" (historically) not just loath it, in order to avoid it. And he has to place it in it's context and consider whether his side was just as "evil".
Fact 1: Before there was an official war Hitler was quite beloved in the West (including the USA), both as an ally against the communists and as an example of a strong "man of the state" against the "enemy within" (leftists, unions, liberals, etc). And they did know how he got in power and what his beliefs were.
Fact 2: Hitler wasn't some lone evil guy who brainwashed a nation. Similar ideas about the historical role of Germany, of the German people, etc, including anti-semitism were held by many German people even before Hitler became known, including prominent philosophers like Heidegger and Carl Smitt, artists and so on.
Fact 3: Anti-semitism was ripe in the US too, as was tons of other kinds of racism (not just against blacks. KKK was also against Hispanic, balkan, etc immigrants). Hitler himself wrote that he took the idea of the concentration camps from the US confinement of Native Americans ( http://www.issuesandalibis.org/campsa.html -- random reference to the first link I found, there are tons of works on those camps you can look up).
Fact 4: Focusing just on some historical events (the Holocaust) misses the bigger picture, of western powers holding BILLION of people as slaves in their colonies, including millions of deaths, lynchings, official executions, maimings and the like. The US didn't have colonies at the time, but they had millions of blacks they brought to serve them.
Fact 5: People who consider Hitler evil (and why not!), leave the people who dropped two atomic bombs on civilian cities -- on men, women, chidren, babies, elderly etc -- scot free. They even ignore that the Japanese were already destitute and surrendering, and revert to their BS patriotically edited "history" to justify something which was merely a live test for the weapon and a "message" for the post-war times. Just an example -- one can find equally horrible acts by the English, Belgian, French, etc, including the Japanese themselves in China and Korea.