I think a better book on this topic would be "Ordinary Men". It covers the "growth" of ordinary police reservists that had little to no Nazi tendencies to brutal mass murderers of Jewish men, women, children, elderly "just following orders". "The Banality of Evil" has legitimate criticisms directed at the book and most notably the narrative Eichmann sought to paint himself in (just an administrative employee), which contrasts with what his co-workers and superiors thought of him.