I haven't really read any of this thread, but this article from the Bulwark seemed to fit the thread title at least,
https://thebulwark.com/the-breakup/. As an anti-Trump Republican myself, so much in the article reflects my own feelings about both Trump and the extreme left. Here are some sections I thought were particularly good.
"What people like me have decided is that despite the policy goodies we get with Trump, despite the enormous social and professional pressure to pledge allegiance and kiss the ring, the larger costs and risks of Trump’s presidency vastly outweigh the real positive goods he has delivered to Republicans and conservatives.
"There aren’t enough tax cuts and judges in the world to justify a president who stands on the stage with Vladimir Putin and sides against America’s intelligence community; who ignores, if not invites, foreign interference in our elections and normalizes unprecedented levels of corruption and incompetence; who abdicates moral leadership both at home and abroad; who lies and obstructs justice and then lies about obstructing justice.
"As a result, we Never Trumpers, like Democrats, believe it would be better for the country if Trump were to lose the next election.
"...we [Never-Trump Republicans] are making the case that the Democratic nominee should be the man or woman with the best chance of beating Trump and getting elected president in 2020.
"Yes, Donald Trump is unpopular compared to most first-term presidents. Do you know what else is unpopular? Eliminating private health insurance, late-term abortions, the Green New Deal, open borders, and free health care for illegal immigrants. (This isn’t my opinion. Go look at the polling.)
"And this is what we Never Trumpers can’t quite get our heads around strategically: A majority of Americans support access to abortion in the first 20 weeks of pregnancy, action to address climate change, permanent status for DACA recipients, a pathway to citizenship for people who came to the U.S. illegally, modest reforms on guns, and universal access to healthcare (though support for that last line-item drops to 13 percent if it means eliminating private health insurance).
"Isn’t that a progressive enough agenda? Because that entire list is there for the taking, if Democrats want it.
"...Now, could Democrats win [swing] voters in 2020 by running the most extreme candidate available? Sure, I guess. Anything is possible.
"But what it all comes down to is this: If you’re a Democrat, do you view the possibility of electing a more progressive president as worth the risk of reelecting Trump?"