It's not hair splitting. It's pretty god damn fundamental. Look at the actual history of dictatorships that arise from democracies, and you'll see they always need that step. They can't skip it. And it has to start early.
In addition to the comments others have made (Trump surrounding himself with yes men that refuse to check him, for example) I think it's worth pointing out both that:
1) You have not provided a citation for this. I would like to see a citation from a historian to the effect that every single dictatorship in history has that single condition you are claiming it does.
2) This is inductive reasoning, which is notoriously weak. If I see a bunch of white sheep...and every sheep I've ever seen is a white sheep....can I conclude all sheep are white?? Of course not. Similarly, no one understands human sociology anywhere near enough to determine necessary and sufficient conditions for dictatorship. Just because it's never happened before (
assuming that is even the case--which I am skeptical of) does not logically imply it
can not happen. You should know better than this.
Your logic, as usual, is lacking.
Not to mention, there are plenty of ways a presidency can be disastrous without "dictatorship" even being approached.
And let me ask you a question (or are you gonna refuse to answer questions, like theprestige??): Over the course of American history, has the power of the presidency been expanded? I ask because I would like you to consider the possibility that the GOP (or Democrats, if that helps you to digest the question) is on a slower trend towards dictatorship, with expanding powers for the presidency being slowly enabled. Maybe not with Trump. Maybe not with a half dozen presidents after Trump, either. But over time. Is that something that concerns you at all?