Behind the scenes Edit
Arendt indeed introduced this phrase in her 1963 book, Eichmann in Jerusalem: A Report on the Banality of Evil. These are the final words of the book. She was responding to Eichmann's apparent lack of guilt for his actions, and claim to no responsibility, as he was simply "doing his job" within the Nazi Party. The Doctor himself would echo her sentiments towards people who give similar excuses, for instance in TV: Bad Wolf.