Common things that pop up in regards to Republicans voting against their own interests:
Women with the attitude that “the only moral abortion is my abortion.”
Immigrants who are angry at other immigrants, wanting to close the door behind them. (Just look at Cubans in Florida)
Log Cabin Republicans, LGBT+ members who are somehow shocked when the party turns on them.
What do most of these people have in common? Money.
Trump supporters are more likely to be small business owners. Capitalism doesn’t care about your skin color, your creed, your nationality, your history, it just wants your fucking money.
It is difficult to get a man to understand something, when his salary depends on his not understanding it.
Upton Sinclair was talking about jobs, but this can be extended to… women who financially rely on their husbands becoming more politically aligned with their husbands (especially if they like the lifestyle), immigrants financially relying on the “good people” willing to hire them as an immigrant (stockholm syndrome?), and the number of rich white gay dudes who may as well have been rich white straight dudes at any other point in history is too damn high (they love to hide behind their sexuality when anyone critiques their horrible positions, “You can’t critique Tim Cook for tax dodging at Apple, he just came out, he’s BRAVE!”).