". . . like those Germans who claimed they knew nothing about the gas chambers."
You don't hear that comment very much these days, but it used to be cited as an example of people who were deliberately blind, who refused to look at, or accept, some evil which they must have known about, or even that those who were pronouncing their ignorance were telling lies. Well, I have news for them: during World War II the average German, particularly the average German civilian, really did know nothing about the gas chambers.