I think a great documentary that explores this territory (but within the context of Indonesia) is The Act of Killing [1]. It can be hard to watch because it lays bare the banality of &quot;evil&quot;. No cackling madmen or volcano fortresses, just ordinary-seeming people who committed mass murder while still believing themselves to be just.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;The_Act_of_Killing" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;The_Act_of_Killing</a>