I don't understand my mother who is a Trump supporter and rabidly so. She is rather educated and worked in a hospital lab for twenty years. My sister is the same way, though listening to Trump and the ant-ivaxers and anti-maskers cost her husband his life. He had a masters and sister is well educated with a four year degree teaching school. It's sad they made dumb choices and he ended up dead. He was a good man just wouldn't trust anything anyone "left" said because they disagreed with his moral stances on things like abortion. If you believe abortion should be legal then everything else you say including water is wet is suspect. To me this crap with Trump is personal. Listening to him got people killed or he allowed people to speak about things they had no business talking about that got people killed like masks do no good. And the fact he tried to be Napoleon light on January 6th and got people hurt or killed for no reason makes me vomit.
I feel for you. I have a friend, although we rarely keep in touch any longer, who was an RN, who I worked with briefly before I retired. She was a very good person, as far as being compassionate and giving good care to her patients. She was about to be married to a man she has met online. They were both in their early 70s and they were both Trump supporters. They refused the vaccines, didn't wear masks and were out and about during the height of the pandemic. Sadly, he died from COVID and she was hospitalized for a few weeks with COVID. Now she spends most of her time at home, can no longer drive, probably has some symptoms of long COVID. I have no idea if she still supports Trump, but she voted for him twice and proudly had a Trump sign in her yard. Like you, I know people who were sucked into the Trump cult, and made choices due to him, despite being otherwise smart, kind, caring people.