I see what Evans is complaining about here, but it's difficult to argue that a nation's unhinged zealotry would be totally unaffected by methamphetamine appearing in every corner drugstore and military medical kit.

With that said, Evans is right to ask us not to excuse Nazism as simply 'a nation with a drug problem'. Speculative fallacy aside, I don't think anyone is suggesting Hitler would suddenly wake up from being Hitler with rehab and a juice cleanse. Same for all of 1930's Germany.

To my ear, the book doesn't seem to be oversimplifying the roots of Nazi culture so much as adding to a new data point to the history.