This. A willful disregard of any factual information that doesn't fit with what they want to believe. Every leading economist in the US stating that Harris' plans were better for the economy and Trump's plans would be very bad for the US economy & would probably send it into a recession and trade war, but many many voters interviewed said they voted for him because of the economy. Vance complaining that eggs cost $5 a dozen whilst standing in front of a display showing eggs as $2.99/dozen.
I think people underestimate how incredibly ill-informed so many voters are. Part of it is the dumbing-down or abject failure of the educational system. The US is an enormous country and educational standards and practices vary wildly between states and areas. I once had a colleague from a southern state argue with me that there were more slaves in the northern states than in the south prior to the Civil War - keep in mind there are loads of records that show this is not true, but it's what she was taught in school.
Add to that, people equating "feelings" with facts. You can see examples of this in interviews when voters are confronted with actual facts - for example, when they claim they love Trump because he gave them healthcare coverage, which was actually done under Obama's administration, or people getting upset because Obama allowed the US to be attacked on 9/11 even though Bush was president. When faced with a fact check, they have said "well that's just how I feel" as if facts=feelings.
Low information voters - Muslims who didn't vote for Harris because they don't like the Biden/Harris response to Gaza and didn't want to vote for a woman, but voted for the guy who moved the US Embassy to Jerusalem and literally tried to install a Muslim ban. Trump has stated multiple times that South Americans are from s&$+hole countries, and are criminals, rapists, murderers, and he intends to round them up into camps and deport them - but Latinos voted overwhelmingly for him. He has discussed stripping naturalized citizens of their citizenship and deporting them. He said if he didn't win, it would partly be the fault of the Jews, but embraces people who proudly fly Nazi flags.
Many conservatives get their news from highly partisan sources like Newsmax and Fox News - Fox News who famously argued in court that one of their most popular news shows should be considered entertainment and that a reasonable person would understand that it was hyperbolic.
And then there's the old double standard - Harris is a "who're" because she once dated a married man who was legally separated from his wife for more than a decade. Meanwhile, Trump has been married 3 times and has cheated on all three of his wives, was found guilty of sexual abuse and convicted of 34 felonies, but apparently it's fine because he's male.
No one in his former Cabinet supports him, except Nikki Haley, in fact, a huge number of the people who worked in his previous administration have come out and stated that he is a danger to the US.