And this piece is exactly a problem I have with the majority of literature on the matter (albeit he might get into more detail in his full books - which I haven't read). It just paints everything done out of pure evil and mental insanity - rather than what lead to these. This is also the cause of the "Historikerstreit" (Historican dispute) between Ernst Nolte and Jürgen Haberman. Not sure how extensive english information about it and what the quality of it is, though.
There are so many factors coming together. Even the hatred on jews has a lot more elements to it - starting with the french action francaise being quite the blueprint to Mussolini and Hitler, to the fact that a good chunk of the bolshevisks were jewish individuals (I think it was up to 60% at some point) and Lenin making it very clear that the only way communism can succeed is by being in the heart of Europe - which resulted in quite a lof of violence within Germany perpetuated by pro-communistic groups (this is also when the Antifa was founded, just saying). There is also the fact that the original plans wasn't a genocide, but exile (I think to what's Madagaskar today, but don't pin me down on it). And that upon the success of the NSDAP getting into power, jewish internationals collectively declared trade war to Germany.
What I am saying is that these things simply do not happen in a vacuum, but if it is about WW2 they are often painted as such - including by some historicans. And I have an issue with that. This has nothing to do with downplaying the horrors, either. I just think these prevents a proper understanding on what happened and how it came to happen.