One of the more dangerous assumptions is that Nazis were overtly and objectively evil from the start. It conveniently looked perpetually different than what we're currently seeing.

I mean, the photos we're being presented - they're not even in black and white!

That is a problem. That's how these things start. You ignore something right in front of your face. The people need to draw a line. While it might not be an extermination camp you dont want to wait until it becomes one. These people in these camps are only guilty of misdemeanors. They are not all violent criminals as trump would have you believe.