We (Americans) think of the Nazi regime in WWII, as most of the world thinks about our U.S. soldiers.
Nobody wants a foreign entity to come in, and throw around its muscle.
Listen, I respect our soldiers, just as Germans probably respected theirs. In the end, they have a job to do, and it comes down to following orders. I bet many Nazi soldiers were good men, family men. I bet a good amount didn't agree with the way Hitler was going, but what are they really going to do about it.
In many ways, our U.S. soldiers are put in the same predicament: Follow orders, travel to foreign lands, and fight a war against your own government's propaganda machine.
Every army in history has created atrocities against innocent civilians. Put yourself in someone else's shoes before you judge an entire nation of people.