You set me off on a mental tangent that I think does relate back, but it's a bit of a story to get there.
In one of my families growing up, the father was like this: very limited vocabulary. He had an excuse: his parents were immigrants living in a community with others from their original country, so he never even heard English until he showed up at school in first grade at age 6. But also, he had limited cognitive skills. Despite that fact he actually got an MBA from a very good school. How? He married a very intelligent wife, who had herself grown up in a household with a very intelligent mother married to a much-less-intelligent father. So she pushed him, did his applications, homework, papers, etc. for him, and in general made him appear more executive-material than he actually was.
When Bush Jr. was President, there was talk about how could he have ever gotten a Harvard MBA, considering how limited his cognitive skills were? He married a very intelligent wife. That was what you did in that generation, if you were a smart woman: you married a man you could train to do what you weren't socially (and sometimes legally) allowed to do. It's known that there was a separate ceremony for wives at the time, celebrating the fact that so many of them were the real reason their husbands got through.
Trump doesn't marry "up". He marries pretty doormats. He doesn't even stay with any one wife very long. There's no one at home with the moral and legal authority to push him 24/7. And so, we (the general public) get the full brunt of his limited life and professional skills without any filter.
Now, which came first, the chicken or the egg? Is his temperament so awful that he simply drives away any woman who could handle him and mold him into a more functional public persona? Or is he consciously choosing to "protect" his ego from being with someone who could stand up to him and thus help him become a better person?