Donald Trump is no Adolf Hitler.
Hitler was smarter, and more charismatic.
The kinds of people who follow him on the other hand, are part and parcel of the kinds of everyday Germans who just wanted someone to Make Germany Great Again. A lot of everyday Germans had to go along, even if they never pulled triggers on executions, to allow the truly evil things that the German government ended up doing.
When it comes to the cult-like behavior that is what worries me. One of the primary methods of indoctrinating someone into a cult is to isolate information flows.
The cult leader is the source of the ultimate truth, and everyone else is lying. Trumpists' have been taught to believe that Trump and his state-owned media network, Fox "news" are the only people really telling the truth. Anything that paints the Dear Leader in a bad like is fake.
It works the same in any country, in any cult.
The Trumpist movement bears a lot of the hallmarks of early Nazi-ism, especially when it comes to identifying an external enemy, "immigrants" and making "liberals" as not patriotic enough for wanting to keep them out.
Where this analogy really breaks down is that Trump et al. are just too incompetent to carry out any kind of pogrom, and there is more than a few decent people who will not go quietly.