This is backed by evidence.
After WW2 there was a lot of research about weather people knew or didn't. Basically the conclusion was: people knew. They actively decided to either ignore it („not my department“), deny it („it's all lies, the scent is just $foo burning“) or justify it („they deserved it“).
But people knew.
wow, what a disaster this post is.
Dude, you are being a huge, immense asshole.