It’s not. Your first step is realizing this. Fascism is a popular belief among a good portion of the population and the voting results, not just in America, show it.
I think this is a misstatement. I doubt that any within the group you refer to could even correctly define Fascism, let alone adopt it as a belief or credo. I believe a more correct statement is that a good portion of the population support political leader(s) who act in a way that clearly fits within the definition of authoritarianism or fascism.
I don't disagree with you, by the way.
I think the more interesting question is "why," because until that is clearly understood, and until someone figures out a workable solution to countering that reason, this will continue to exist.
Now, I know your theory is that these people are subhuman pieces of shit, as I believe you have referred to them. It's a theory.
Others think it can be neatly described by racism.
I have my own theory that strangely enough, comes from experience working within groups or committees that have a common task in front of them.
I think if you take any group of people and task them with an assignment (in the case of the citizenry in this country, elect a working government), a not insignificant part of that group is hoping that someone just takes charge and tells them what to do. They're hoping that someone steps forward and says "this is what we're going to do, this is how we're going to do it, and I'm going to take charge to get it done." And they will throw their full support behind such a person or persons, even if what is being proposed is not that great of an idea.
Why do they do this? I'm not sure. I suspect it's a combination of fear (they themselves don't know what to do), lack of intelligence (see #1), laziness, indifference. Who knows.
And I'll tell you what, when you see that happening within your group, it takes a lot of hard work to change perspectives of people, to get them engaged.
I am not a psychologist or a psychiatrist, nor do I pretend to play one on tv. But I would guess that many of you have participated on committees or groups and have seen something similar.