A stunning number of people in the links of that chain could've stopped it, and none of them cared to risk their employment over it.

I've seen it said that if you live in the US, you can ask yourself a question: "If you lived in Nazi Germany, what would you have done to oppose that state?"

The answer: You're doing it right now. Nazi Germany's leaders explicitly stated that its model of colonialism and expansionism in eastern europe, eugenics practices, and its racial state, were all based on the US model, which nearly successfully carried out everything Nazi Germany failed to do: eviction and genocide of its indigenous inhabitants, stealing a continent, and erecting a white-supremacist state on top of it.