In her book, "Eichmann in Jerusalem," Hannah Arendt notes that Adolf Eichmann had no particular hatred of Jewish people, nor of Freemasons (he even nearly joined the Freemasons before getting invited, via personal connection, into the National Socialist Party). He did what he did out of a desire to advance in his career, and he (like other Nazis) told himself that, if he did not do these things, others would anyway.

This is the banality of evil.