That's fair, let me go into more detail.
I know a lot of people who fervently believe that Trump is the second coming of Hitler. If you dig around on Twitter it won't be long before you find this sentiment practically everywhere. It's not "could be a fascist" it is "actually is a fascist and we need to actively resist".
This is not unique to Donald Trump. W Bush is the most recent example where Bush=Hitler was practically a slogan for liberals. Again, people claimed the same thing. "Policies and views are similar therefore" and went straight for the extremes. They didn't go for the benefit of the doubt at all, despite there being a lot of evidence that Bush was in no way at all a Nazi. I think it's fair to argue that it's a tenant of faith for liberals that all conservatives hate gays, hate minorities, hate women, etc. That these people exist in the Republican party is impossible to deny. To tar and feather the entire Republican party as this way is how we get to this binary world view.
As far as Donald Trump is concerned, I think if you've really dug into Donald Trump and done your homework on him, I think that calling him a fascist is grossly unfair. Let's take this article from 2000:
http://www.advocate.com/election/2015/9/28/read-donald-trump...
"Do you think gay people should be allowed to serve in the military?"
"Yes, if a gay person can be a doctor or a lawyer or a teacher or take another position of responsibility, why can't they serve this country in the military? “Don’t ask, don’t tell” has clearly failed. Gay people serve effectively in the military in a number of European countries. There is no reason why they can’t serve in the United States. Frankly, the state of our military is a wreck. Military pay is a joke, military benefits are ridiculous, and we can’t attract the kind of quality people we need to have an effective fighting force. The Pentagon is wasting millions on weapons they don’t need instead of focusing on the military needs in the changing world situation. The truth is, our nation defense is in the weakest state since Pearl Harbor. I favor a total reorganization of all branches of our military, and I would address the gay question more forthrightly within that reorganization."
"Are you running just to beat Pat Buchanan?"
"I used to like Pat. I was on Crossfire with him. I thought he was a nice guy. Then I read the things he had written about Hitler, Jews, blacks, gays, and Mexicans. I mean, I think it’s disgusting. That speech he made at the ’92 Republican convention was a disaster. He wants to divide Americans. Clearly, he has a love affair with Adolf Hitler, and that’s sick. Buchanan actually said gay people had chosen “satan[ism] and suicide.” Now he says he welcomes gay people into his campaign. The guy is a hypocrite."
Note that these views are not in a vaccuum. If you go back and read his views before the 2016 election, you get the picture of a Donald Trump who reads like a liberal. Nothing like a fascist at all. And yet many people have practically jumped at characterizing Trump as the second coming of Nazi Germany. The reasons why are a much longer discussion. I'm not saying any of this disproves that he is a Nazi. I'm saying that this decreases the likelihood that it is true. This is why I say people are expressing a binary worldview. From what I can see, many are not expressing that there could be a third possibility. Or fourth. Or a myriad of options.