The Nazis killed a lot of Polish people, millions of them, actually.
Generalplan Ost proves Nazis wanted to destroy Poland & the rest of the Eastern European nations by mass murder, deportations, etc.
There was a lot of internal debate about how to destroy the Poles. One of the plans was to have the Poles speak German, and become German. There are many blond haired, blue eyed Poles that the Germans would have loved to have had. Another plan involved letting the Poles all die from neglect. Most of the food the Poles would grow would be stolen from them, and Poles would be offered some food (but not enough) for working for the Germans. It might take a hundred years, but either way in the end, no more Poles.
As I mention, not anything redeeming about the Nazis. I don't think any good human would want to associate with them.
It all reminds me of the internet joke, "the only good thing Hitler did was kill Hitler."