Roger Griffin, an authority on Fascism, summarizes his conclusions about Nazi mass-murder on his website:

Since so many millions were involved in Nazism and the Holocaust, this can’t be explained in terms of madness or pathology.

Why this a priori assumption? What logic leads to this conclusion? Why can't we say that millions of human beings are mad and pathological?

Donald Trump has provided a service, opening our eyes: entire societies (and their leaders) can be mad. We can begin to reevaluate assumptions that have guided historical research.

If Donald Trump and his followers suffer from a form of insanity (the precise nature of which is yet to be defined), why can't we say the same thing about Mao, Stalin, Pol Pot, etc.?

Why can't we begin to consider the idea that core dimensions of the historical process represent manifestations of madness or insanity? Why can't we say that MADNESS AND INSANITY ARE NORMATIVE.