However the explanation for the rise of Hitler you allude to is woefully incomplete. Hitler and his party didn't get into power by winning the majory popular vote. Instead the Hitler and the Nazis formed a coalition with the monarchists and convinced Hindenburg that they would help restore the Monarchy if Hindenburg helped them take power and granted them new powers.
I'm not going to claim we are necessarily in the same situation today, but I do think it is worth being aware of how this kind of thing can happen.
We should be extremely wary about giving a charismatic leader extraordinary powers, even if that leader promises that power will only be used to accomplish your goals.
However the way I see it, people (not you, I just mean in general people who seem to believe Trump will bring about the 5th Reich) are probably out of ignorance of the history there also massively oversimplifying and overestimating how much power the president ultimately wields, especially when compared to Weimer-era Germany. People aren't aware that there are safety mechanisms in the US that didn't exist in the Weimar Republic, and as such simply bringing up that "This is exactly what happened with Nazi Germany!" is massively oversimplifying things as well from the other side.
The comment my comment was replying to did this exact thing, in fact, where they equated the election of a charismatic leader to what happened with the Nazis.
I do agree with you though, I personally tend to align with Frank Herbert when it comes to people who want to wield power and rule over others, in that they should be studied and watched closely and carefully and disposed of swiftly if they pull any Hitler-tier shenanigans