A rat catcher catching rats.

Psychologist dude: "A rat catcher catching rats." Is that the kind of thinking it takes to carry out state-sanctioned mass murder? Not just blind obedience, but also a belief that your victims are not human?
Hermann Göring: Let me ask you this. What was Hiroshima?
Was it not your medical experiment? Would America have dropped bombs as easily on Germany as it did upon Japan, killing as many civilians as possible?
I think not. To an American's sensibility a Caucasian child is considerably more human than a Japanese child.
Psychologist dude: America was at war with Japan. A country that had attacked it without provocation. You murdered millions of your own citizens.
Hermann Göring: What about the American citizens of the Japanese race put into ''protective custody'' in your own concentration camps?
Psychologist dude: That was wrong.
Hermann Göring: Why was this not done to Americans of Italian and German descent?
Psychologist dude: I said it was wrong.
Hermann Göring: What about the Negro officers in your own army? Are they allowed to command troops in combat? Can they sit on the same buses as the whites?
Segregation laws in your country and anti-Semitic laws in mine: Are they not just a difference of degree?

(fiction from a movie, Nuremberg, 2000)

edit... this might actually be true. Turns out the dude is Gustav Gilbert and he really did talk a lot to Göring, subsequently writing The Nuremberg Diary (there's an interesting excerpt about leading people into war there, which i quoted a couple of years ago)