Earlier quoted context omitted.
Hence the problem was how to overcome not so much their conscience as the animal pity by which all normal men are affected in the presence of physical suffering. The trick used by Himmler--who apparently was rather strongly afflicted with these instinctive reactions himself--was very simple and probably very effective; it consisted in turning these instincts around, as it were, in directing them toward the self. So t…
Wow this is interesting. Is that a hypothesis or is that according to Himmler's own account?
Himmler speaks of the challenge of remaining a decent person despite witnessing and committing atrocities (the section around “Dies durchgehalten zu haben, und dabei – abgesehen von menschlichen Ausnahmeschwächen – anständig geblieben zu sein”), showing the kind of reversal at work that Arendt describes.