There is what the public thinks they rejected due to propaganda, and there is what is really going on.
In this case, the propaganda said that Trump was fascist and Harris was leftist.
The reality: both parties are market capitalists, and cater to their wealthy donors, and disregard what the public wants if it conflicts with what their wealthy donors want.
Even if their thinking is based on false premises, as you claim, they have legitimate grievances. The Democrats will never get their votes if they don't address the grievances with a realistic alternative plan.
I think I know who you are talking about. The loud and proud ones. But what the loudest people are saying is no necessarily what most people are thinking. So you can't assume everyone thinks like them.
Most people's grievances right now are the economy and inflation. And they want change. They want the elites to have less control over their lives.
Sure, the right has some crazy ideas. So does the left. But the middle decides elections because they are the swing voters, and the middle's main grievances are the economy and that they feel helpless in a world where the wealthy control everything.