I suggest reading and considering Hannah Arendt's famous work, "Eichmann in Jerusalem: A Report on the Banality of Evil" for a different perspective on this.
Our typical idea of a perpetrator of evil is this malicious, moustache-twirling, cackling super-villain. The reality of how very evil acts are perpetrated is typically much different, though. It has more in common with what we see with the Milgram experiment: lots of small cogs doing highly compartmentalized, abstract work that simply adds up to something ghastly. Paper-pushers who simply "do their jobs" without bothering to examine or take responsibility for the ethical implications of their work output, preferring instead to shift that ethical responsibility to the superiors/authorities who handed down their orders.