First, the difference between "bad things" and "atrocities" is the extent or severity.
Second, everything I've seen indicates people did not know a lot of what was going on.
The internet was not a thing. News was being gotten via short videos prior to movies at the movie theater. It was significantly delayed compared to news these days.
Soldiers were shocked at what they found when they liberated concentration camps.
A game was created to explain to modern peoples or demonstrate how this could be engineered while keeping most participants in the dark. People delivering train loads of people to concentration camps didn't know the full story.
First, the difference between "bad things" and "atrocities" is the extent or severity.
Second, everything I've seen indicates people did not know a lot of what was going on.
The internet was not a thing. News was being gotten via short videos prior to movies at the movie theater. It was significantly delayed compared to news these days.
Soldiers were shocked at what they found when they liberated concentration camps.
A game was created to explain to modern peoples or demonstrate how this could be engineered while keeping most participants in the dark. People delivering train loads of people to concentration camps didn't know the full story.
Etc.