I won’t go into whether the Germans knew about the Holocaust or not since that’s going to be a debate until the end of time (at most, I’d probably say that it was indeed closer to complete secrecy since I remember seeing in a documentary that Heinrich Himmler actually got scolded for giving any hint at all about it in a phone call about the planned genocide at the SS headquarters. No reason to claim most of the populace knew if Himmler, of all people, got scolded for potentially blowing the operation via a phone call in his own SS headquarters.).
However, I WILL mention this bit: The German people never “put” Hitler in power, because he was never actually elected into the Chancellorship in the first place, he was appointed to the position by Paul Hindenberg. This was made pretty clear in the RiseOfHitler website. And quite frankly, they had pretty bad options all around. Even if they didn’t elect the Nazis, the other parties weren’t much better, such as the German Communist Party which were the Bolsheviks in all but name and the Social Democrats who were basically Fabian Socialists. I always get irritated with when people act like the German People had any real say in Hitler gaining power. Last I checked, “appointed to the position by the actual leader of the country” =/= “the people directly electing that person”. And bear in mind, I’m someone who utterly hates the democratic process largely thanks to a lot of Christians being massacred by democracy since the French Revolution. If ANYONE ought to be blamed within Germany for Hitler’s rise, it was Paul Hindenberg and his staff (though to be fair, Hindenberg was undergoing dementia, and he also really wanted to retire from being president, but Hitler made running again unavoidable). Doesn’t help either that the SA were engaging in a lot of voter intimidation (and let’s be fair, I could easily say America was responsible for a tyrant like Obama being elected president under the exact same circumstances).