To look at it another way, the longer they live, the longer that they have to carry the burden of what they have witnessed/facilitated/been party too...
If all the staff across the Reich who didn't agree with their roles had made a stand, then their numbers would have been added to the total of those killed. Those who could, ran away, the rest simply focused on their immediate duties as a form of self defense.
There's a 2015 film called Amnesia which explores this idea.
Just to be clear, I am not trying to defend the indefensible. Those were difficult and dangerous times, and whilst we would all like to be able to say that we would have behaved differently in those circumstances, I am not sure that, when faced with it, that we would have...