IANA a Republican, or a conservative, but I really don’t think any of what follows is “concern trolling”.
What are the professed core values of Republicans and/or American conservatives?
Patriotism and a strong national defense. Trump has undermined our most important alliances, especially NATO (something seen as pillar of American national security by people in both parties, and a major vehicle for American world leadership). He’s also said things about the U.S.A. that would get a liberal or Democrat crucified–on being told that Putin is a killer, Trump replied “You think our country is so innocent?”, a remark that American conservatives would surely be up in arms about under other circumstances ("There they go again, with their ‘Blame America First!’ and their “moral equivalence”!).
Free market economics. Trump openly embraces protectionism. He has also made a number of statements indicating he thinks the President has some power to order private companies to create new jobs (…or else). There is also the lurking issue that Trump has by all accounts been a lousy capitalist, what with the multiple bankruptcies and all, and has also completely failed to adhere to the basic standards of ethical business conduct that any rational supporter of capitalism would say are necessary to keep a free enterprise economy running–stuff like paying contractors what you owe them and things like that.
Deficit spending. (Kind of a sub-head under “free market economics”.) Do I even need to elaborate on this one? Granted, we’ve known the American Right were big old hypocrites about deficit spending since at least the days of Dick “Deficits Don’t Matter” Cheney–or even St. Ronnie himself–but still, “Holy fuck, you guys!”. (And I’m not even talking about the COVID-19 deficit spending, here.)
Family values/Traditional religious morality. Trump is thrice-married, paid off a porn star to cover up an affair, has bragged about “grabbing women by the pussy” and about walking in on half-naked underage beauty pageant contestants, has a reputation for being a foul-mouthed braggart that goes back decades, made his fortune running gambling casinos, and is in general a crude, worldly man with no evident knowledge of the Bible (“Two Corinthians”) or of Christian (and especially Evangelical Christian) ethics–Trump has publicly said that he doesn’t think he needs to ask God for forgiveness because doesn’t think he’s done anything he needs to be forgiven for.
Secondarily, we have issues of “states’ rights” and “the Imperial Presidency”. The truth is, those are issues that make hypocrites out of a lot of people; Democrats were quick to attack the overweening power of the Presidency when George W. Bush was in office; then turned to attacking the “obstructionist Congress” for much of Obama’s Presidency (and vice versa for the Republicans, of course). Democrats often favor “states’ rights” when it comes to marijuana legalization, but not so much when it comes to abortion. Progressives had a period of defending states’ rights on same-sex marriage between its first legalization in Massachusetts and the Obergefell decision, but certainly not after Obergefell.
Still, Trump has been especially blatant in his attacks (or at least rhetorical attacks) on the separation of powers within the federal government, and between the federal and state governments. And his rhetoric about Presidential power in general would certainly scare the daylights out of pretty much all of the Founding Fathers.
Now, it is certainly true that a large number of Republicans either never really held those values, and only wanted “tax cuts for the rich!” and/or “POWER! UNLIMITED POWER!!!”; or to be somewhat more charitable about it, are willing to sell out large swathes of their professed core values for tax cuts for the rich and favorable judicial appointments.
But it’s hardly shocking that members of a group of people who profess to believe in patriotism and a strong national defense, free market economics, and traditional moral values (not to mention “limited government” and respect for the original intent of the Framers of the Constitution) would be dismayed by Trump. Simply saying “Well, gosh, he’s a little brash, but isn’t he doing what they wanted all along?” really fails to capture the breathtaking hypocrisy of a huge part of the Republican Party and the modern American conservative movement on so many, many issues.
The surprising thing isn’t the existence of “Never-Trumper” Republicans, the surprising (and dismaying) thing is that there aren’t more of them.