Does "doing one's job" excuse people from accountability?

Not long ago, I saw news reports of an elderly (90?) European man who was being tried in court for his part as "bookkeeper" in some of the human atrocities that were carried out during the Nazi era. 

He apparently received a four year prison sentence, though it is unclear whether or not he'll actually have to serve, due to his age.

In this case, the individual was 'doing his job', and, likely would have suffered the wrath of the Nazi regime if he had 'refused'. He is now (decades later?) paying the price for 'not refusing on moral grounds'.

This is not an isolated case, as numerous similar cases are unfolding. And, of course, it is because we are still trying to come to grips with the overall horror and 'crimes against humanity' that the Nazi regime was seemingly intent on continuing, until it was stopped by the 'Allied Forces', thankfully.

So, while the Nazi example might certainly be an 'extreme' scenario, I am thinking it is basically similar to some of the things we are experiencing today, where we are finding fault with some who ARE 'refusing' job-duties which may be an offense to individual, personal beliefs and commitments.

WHAT IF...in 50 or 60 years time, new generations of humans ultimately decide to reverse some of today's thinking and living styles, and begin seeking out those of us living today who might have 'violated' their 'new way of thinking', because we were "just doing our jobs"?

Just sayin'...