Hitler laid out exactly what he was going to do in speech after speech and in Mein Kampf. All of it sounded so fantastic that most people probably didn’t take it too seriously, but then he began to deliver on his wild claims. He said that he would achieve 100% employment and recovery from the Great Depression, and he did. He said that he was going to build a German Empire from one side of Europe to another and avenge the German defeat in WW I, and he did. He said he was going to make the Jews disappear, and he did that too, so the citizenry certainly knew that something bad had happened to their Jewish neighbors at the hands of the government. But I’m sure they weren’t very interested in what the details of that bad thing might be. In any case, during wartime no one is supposed to talk about anything the government is doing in any country. During the Manhattan Project to build the atomic bomb in the USA, only a busload of the hundred thousand or so people working on the project knew what they were actually doing.