It’s several different things. Some of it (25%?) is just hatred of Democrats. I’ve got a neighbor who says right out that Yeah, Trump is crazy/a moron/evil/ demented/ etcetera but he hates all Democrats because they’re committed to socialism and communism and he’s not about to see his hard-earned etcetera turned over to lazy people so he’s going to vote against all Democrats forever.
Parts of it (another 20%?) are just dissatisfied with life, malcontents who buy into conspiracies (like “All your problems are caused by left-wing lunatics”). You cite divorcees—I have a cousin from a generally well-educated, liberal family who went through a horrific divorce, and he decided that he got a bad deal because the judge favored women over men so he channels his misogyny into his voting choices, and Trump offers him the illusion of everything reverting to a sunnier time when judges favor men over women.
Some of it (35%?) is rich people viewing his economic policies being in their favor. They may even concede that he doesn’t actually have any coherent economic policies, just ones that favor DJT personally, but that means they also favor other rich people so they’re in favor of him, not viewing the long-range policies as things that matter, just their wealth over the short run.
Some of it (20%) is one-issue fanatics, like pro-Israel voters or anti-abortion voters who think he supports their one issue. I know a woman whose only question literally is “Is he good for the Jews?” and she thinks Trump is, because he says he is. Some of these are simply racists—that’s their one issue: “Is Trump in favor of white people?” (Answer: yes he is, and he’ll tell you so.)
Some are low-information voters, (10%) people too dumb or too misinformed to be granted voting privileges, except that there is no threshold for how informed you need to be to vote. Some of these, I’m sure, vote D instead of R because they don’t know the difference, but even half of the Low-Info vote is a lot.
Some are just disruptors, (5%?), those who want the status quo shaken up just because it’s fun to watch. Some disruptors are probably pyromaniacs, child molesters, and other sociopaths.
The total, you may have noticed, is more than 100% because it’s probable that there is a little overlap (rich racists, low-info malcontents, and so on) but I think these groups are mostly separate and are coming from entirely different places. Also I’m not so good with addition.