I think there are tens of millions of people who simply cannot believe the truth. People become comfortable with what's familiar, and ignorant of that which they haven't experienced. That makes reality far outside those parameters unfathomable.
I would bet if you polled the American people as to whether they thought the United States could EVER elect a communist regime, a vast majority would say no, never. If you polled them as to whether the United States could EVER elect a regime that would commit holocaust, you'd get the same answer. People don't believe it can happen here.
I used to doubt the boilerplate rhetoric about the uniqueness of the American character. I used to believe that it wasn't the people that were unique, but our system of government. Now I realize that it was the people all along - the people, their heritage, their faith in God, their values, their ethics, their strength, and their families - allowed to flourish in liberty, protected by our constitution.
Without those kinds of people - most of whom have died generations ago - our constitution is worthless, just as John Adams said.
"Our Constitution was made only for a moral and religious people. It is wholly inadequate to the government of any other."
The rudderless, characterless people alive today cannot fathom that the freedom they have had or believed they had could ever be taken from them. They are giving us the government they deserve.