I visited the concentration camps at Auschwitz and Birkenau on Wednesday. Above the entrance (see photograph) you'll see the words "arbeit macht fret" - or in English, work shall set you free. This was obviously a guise to cover the gruesome nature of the camps.
I couldn't possible imagine the horror of being sent there as part of a death sentence, but I did try and imagine what it may have been like to work there as an employee. (Apparently, as many as 7,000 people were employed there at the camp's peak). What I mean by this is that work can be an enormous distraction from what is going on around us. After a while it may have been possible to become de-sensitised (to a point) to what the camp was really about.