Indeed. But also imagine that as an engineer on any secret NSA project, being shown real information regarding atrocities that have never been publicised and knowing that you can help to make the world a better place. You would have the passion and motivations to do these things and have meaning in your life and work.

Evil in this case is an aggregation of actions by many parties, not individuals and is rarely committed by the tool makers. However, it's always justified by the perpetrators.