After four years, Americans were as free as they were before he became president, (except for COVID restrictions.) There were no boxcars full of minorities being hauled off to concentration camps. In fact, no forced labor camps. There were no pogroms carried out against the Jews or anybody. That begs the question: If Trump were truly a Nazi, why didn't he ever do any of this? Was he too busy cutting taxes and regulations?
If Trump is a fascist, especially a Nazi, he's certainly a very poor one. If his followers are fascists, they sure cling to a lot of non-fascists ideals. One of the defining traits of Nazis was their violent antisemitism. Trump ended the Iran nuclear agreement, something that the Israelis celebrated, and their Prime Minister at the time called for in front of the UN. This paved the way for one of Trump's in-laws, one of his Jewish in-laws to broker a peace deal between Israel and several neighboring Arab states. He then moved the American embassy in Israel to Jerusalem. These are things that a true Nazi would have a hard time doing, and even a harder time selling to his supporters.
Persistent comparison of Trump's followers to Nazis is not just unfair and unjustified, it can be downright dangerous. How many more Shannon Brandts are there out there, just waiting for a chance rid the world of MAGA Republicans? What, besides the demagoguery of Biden, fuels the hatred of Trump supporters? And notice, that the hate is being directed not just at Trump himself, but those who are outspoken in his support. The Democrats are trying to create an association in the public's mind between support for Donald Trump and hatred for democracy.