Going to abandon your "I never said that!" defense and instead get back to the issue.
During World War II, there were absolutely staunch members of the Nazi party who could reasonably claim "I didn't know!" Germany was, after all, releasing films of how concentration camps turned the evil, peace-hating Jews into productive members of society, showing them working hard and their kids skipping in the yards. If you read the accounts of the time, several people believed just that. To paraphrase their views:
"Look, I'm not the bad guy here. I just want Germany to be great again and end the twin threats of globalism and the Jews, who are trying to ruin the country. Why should good Germans support the evil Jews who hate good citizens like me? These concentration camps are a great idea because they keep Germany safe and they reform those greedy evil Jews."
Replace "Jews" with "Somalians" or "Muslims" or "illegal immigrants" and you have today's right wing rhetoric.
You suggested above that of course all real Nazis are evil. And I agree. Even if some of them didn't know, there comes a time when the evil being done is so great that you have a duty to be informed, and "I didn't know" is no longer an adequate defense. The Mother character in "The Boy in the Striped Pajamas" comes to mind here - perhaps a good person looking out for her family, but also indirectly supporting a genocide.
Now, today's far right conservatives are mostly not Nazis. (Some are, of course, as we have seen by their leaked chats and the flags they carry.) But their message and methodology is VERY similar if not identical:
1) Identify a scapegoat, declare that that scapegoat is the cause of all your problems, arrest them and put them in concentration camps, then declare victory. Say they are “vermin” and are “poisoning the blood of our country.” Unite your followers against them.
2) Use the power of the government to crush opposition. Sue law firms that defend your enemies, declare other political parties "terrorists," claim that peaceful protests are illegal, empower your own special police to ignore the law and intimidate/threaten/kill anyone who opposes them.
3) Cultivate a captive press (via Hugenberg for Hitler, FOX News for Trump) and sue/cripple/destroy all other media. Trump recently got an interview taken off the air by threatening to have the FCC pull a station's license if they aired it and has several lawsuits against news organizations that reported things that affected him negatively.
4) The Big Lie. If you repeat a lie often enough people may start to believe it. For Germany, it was "Jews are the cause of all our problems but they are now under control and we are treating them well." For Trump, the biggest one was "I really won in 2020."
5) Accusation in a mirror, where a politician accuses other people of doing what he is actually doing. This was a favorite of Goebbels, who would regularly accuse other countries of genocide. For the Trump administration, it is their accusations of rape, pedophilia, cheating on elections, fraud, mental incapacity, stealing taxpayer money and taking bribes.
A German historian said that Germans of the time thought this way about it all: "OK, Hitler was saying all these extreme things but we realize he was a popular politician and we thought that he was just saying things that he didn’t really mean, that he was just exaggerating a little bit. Someone said the demands in Mein Kampf we took as the dogmas in the Bible – no one thought that these things would be fulfilled 100%." This is almost word for word what conservatives are saying about Trump today.
So while modern Trump supporters are not Nazis, they are following the same playbook. And there comes a time when saying "well, I just didn't know!" no longer works to claim "I'm still a good person" in the face of such strategies.