I mean, the same logic works for the Wehrmacht itself. There were a good six years between the Nazis taking power and the invasion of Poland. Plenty of time for propaganda pushing on top of the resentment from losing WWI. Nobody sees themselves as evil.
Like, if you want to go full materialist and say everyone is a product of their times then sure, but that line of thought is really only suited to historical research. It doesn't serve a purpose politically other than to absolve those people of any crimes they committed, and since that doesn't seem to be what you're going for, it's kind of a weird argument to make on a leftist politics website.