Historians and their readers bring an unavoidable perception bias to the story: if a historical event caused shocking destruction, then the person behind this event must have been a correspondingly giant monster. Terrifying as it is to contemplate the catastrophes of the twentieth century, it would be even more frightening to imagine that humanity had stumbled unthinkingly into its darkest moments. But a reading of contemporaneous accounts will show that both Hitler and Stalin struck many of their countrymen as men of limited ability, education, and imagination—and, indeed, as being
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