There are a bunch of Chinese in a city called Nanjing who would disagree with you.
While yes, when someone says a certain person is a self described nazi in post WWII time frames, we can assume they were a bad person with some high probability, saying everyone who belonged to the nazi party was evil is not an accurate statement. This is especially true for those members who were there before the war actually started.
Note: I want to be very clear I'm not defending nazis here. I tend to take the 1930s captain America approach with them. I just want to stay away from "all of X are evil", because that's how historically justification of genocide has been used. I could better explain with an analogy, but that would cross into political discussion and that's not allowed. I'll just say, "Is it possible, when talking about a group of millions of people, that some of them were not evil?"
On a related note, when I was deployed (and is true of every army all throughout history), when you are going to war, or preparing for war, it is drilled into you how the enemy aren't human. they aren't people. They are all evil. They are all monsters. Xenophobic terms are thrown about with abandon. This is done because when the fighting starts, you can't hesitate to shoot the enemy soldier because if you do, you or your buddies die first. Viewing the enemy soldier as a human being just like you causes hesitation. It was a particular point of inner turmoil within me in my 20s while I was serving, reconciling that training (which I understood why they did it) with my personal outlook on humanity.
Naturally the big drawback to that is that it creates a ton of racism after the war is over, as those feelings carry on. My grandpa hated the "japs" for his entire life, but otherwise you would never think he was racist at all, based on how he was repeated trained and his experience on the island hopping campaign in WWII. My dad hated Vietnamese (which made him racist towards a lot of non-whites (not just Vietnamese) after Vietnam, when by all accounts, he wasn't prior.)