The Trump/Hitler comparison is one that needs threading with a fine needle. Obviously and thankfully, Trump hasn't murdered 11 million people. But the demagoguery, particularly using prejudice as a weapon, is spot on. That's basically what DonBusch said. Hitler didn't invent European anti-Semitism but wielded it very well. Similarly, Trump didn't invent American racism but his declaration for the Presidency began with racism. It's only gotten worse from there. His racism predates June 2015 but that is another story.
Since adulation--whereever it comes from--is one of the few things that matter to him, he also just happens to be the one of the few people shameless enough to use racism for his own ends. It's why he couldn't bring himself to disavow David Duke during the Republican primaries. It's also why he reversed course on Charlottesville to praise people on both sides. He knows his audience. When he invented the row about NFL players protesting the national anthem, that controversy was obliquely about race yet Trump never framed it that way. Why then were Trump supporters who agreed with his faux patriotism referring to black people as the n-word in a reporter's presence? (
https://www.politico.com/magazine/s...rump-johnstown-pennsylvania-supporters-215800). Race is a core component of why some of his supporters love him. Much like they saw him as their candidate in 2016 and praised his Charlottesville reversal, white supremacists had zero issue with Trump's Sunday tweet.
So Godwin's Law nonewithstanding, to compare Trump to Hitler because of the demagoguery isn't off base at all. The only other teeny difference is demagogues are usually good orators. No sane person could ever describe Trump as such. I know plenty of people whose native tongue isn't English that make Trump look like he's an ESL student.