Here is a thought provoking essay from Reggie Hamm's blog:
Although I am sympathetic to Reggie's views, I have a few additional comments.
A single person cannot FORCE an entire nation to do anything. And for him or her to lead their nation down the path Hitler did requires a shared calamitous history leading them to believe they are doing "the right thing".
The "Hitler" known as Abraham Lincoln succeeded because the people of his country had such a shared history. And the author of this essay proves that acceptance of "doing the right thing" excuses just about any atrocity you can name. I agree that facile comparisons of our presidents to Hitler are childish, but don't believe for a second that it could not happen here.
Our so-called wonderful form of government did not prevent the extermination of the American Indians, the imprisonment of the Japanese by FDR, the mass murders in Indochina by LBJ and Nixon, the starvation of millions in the Middle East by Bush 1, Clinton, Bush 2, and Obama ad-Dajjal, or our insane brutal wars against Afghanistan, Iraq, Libya, Syria, and Yemen. History proves we are quite capable of such horrible acts, and given the right spark we'll commit them again.
Should you disagree, just listen to the vile rhetoric spewing from the anti-Trump movement. There is enough hatred there to keep a Hitler busy for years to come.