You bring up a few things here.
- Culpability on the part of those who work for a government committing evil acts
- Culpability on the part of citizens of a government committing evil acts
The simple answer is, we don’t know how God will judge these individuals truly.
My Daughter’s Godmother studied in Austria and visited Auschwitz while over there. They got to go in a few places where others are not typically allowed to go. She said it was very fascinating and also very sad. They still have piles of shoes that had belonged to those who were gassed.
Saint St. Maximilian Kolbe, a Polish, Franciscan and Priest volunteered to die in place of a stranger at the Auschwitz concentration camp. The man had a Wife and Children and St. Kolbe did not. But, sadly, when Franciszek Gajowniczek had returned home, his sons had died in a bombardment. The man did go on to live until he was 94 years old.
Some of the greatest Saints come out of the Histories darkest times.
I am not someone who believes that we are ultimately responsible for the sins of others, however, we are called to love, support, and care for others who are in need.
I hope this helps. Welcome to CatholicTalk by the way : )