I had the same social studies/history teacher for 2/4 years of high school so I'll just refer to his classes because I literally don't remember the other 2. Guy eventually become a super chud and when Trump first ran he filled his yard with Trump signage. In school he kept his political opinions mostly under wraps, at least not overt. I was going to a mostly white suburban high school at the time and never had the experience that people were defending nazis from the Nuremberg trials. The education around WWII was pretty standard USA did all the heavy lifting, the nukes were justified, the nazis were bad but don't think too hard about operation paperclip, and look how bad the USSR was sending waves of humans to die.

I also remember in that class we had to pick a US president and write a glowing essay praising them. I do remember thinking it was impossible, doing some cursory research and then learning about the New Deal and FDR for the first time and easily wrote it while bashing Reagan. Was the only group to pick FDR and I'm pretty sure a few picked Reagan and the standard early presidents everyone loves to lionize with next to nothing being said about slaveholding status.

I was also full in my conspiracy theorist arc in high school and was able to convince the teacher to let us watch Zeitgeist in class and so the entire class got to watch 2 parts of it, the 9/11 was an inside job, and the federal reserve system part where it argued:

Part III states that the Federal Reserve System is controlled by a small cabal of international bankers who conspire to create global calamities to enrich themselves. Three wars involving the United States during the twentieth century are highlighted as part of this alleged agenda, started by specifically engineered events, including the sinking of the RMS Lusitania, the attack on Pearl Harbor, and the Gulf of Tonkin Incident. The film asserts that such wars serve to sustain conflict in general and force the U.S. government to borrow money, thereby increasing the profits of the international bankers. The film also claims that the Federal Income Tax is illegal. Zeitgeist: the Movie claims that the U.S. Government's income tax is unconstitutional.

Part III also alleges a secret agreement to merge the United States, Canada and Mexico into a North American Union as a step toward the creation of a single world government. The film speculates that under such a government, every human could be implanted with an RFID chip to monitor individual activity and suppress dissent.

So in the end I suppose the nazi propaganda was coming from inside the home. The website "The United States is the Biggest Terrorist Organization on Earth" or something close to that title helped sorta break the brain worms, it was also super far down the conspiracy rabbit hole but channeled it in the right direction to eventually lead to my leftist awakening.

Also that teacher refused to ever tell us who he voted for in Obama v. Mccain because it was too political and that if we ever came back after graduating he'd tell us.