Reading Eichmann in Jerusalem

'The trouble with Eichmann was precisely that so many were like him, and that the many were neither perverted nor sadistic, that they were, and still are, terribly and terrifyingly normal. From the viewpoint of our legal institutions and of our moral standards of judgement, this normality was much more terrifying than all the atrocities put together, for it implied (...) that this new type of criminal, who is in actual fact hostis generis humani, commits his (sic) crimes under circumstances that make it well-nigh impossible for him to know if to feel that he is doing wrong.' 

Hannah Arendt, Eichmann in Jerusalem, p. 276