As suggested by @What_Exit, I am starting this discussion in response to the discussion held here, to avoid thread-shitting there:
I believe that discussion is disingenuous on its face because it begins with erroneous assumptions and then asks the wrong question.
Donald Trump was never a RINO. He was never a Democrat, a Republican or anything else. Donald Trump was and is a corrupt, selfish person, whose only motivations ensue from his desires to enrich, pleasure or glorify himself. He is a bigot, a racist, a misogynist, a being entirely without grace, generosity of spirit or empathy.
Donald Trump never changed. The shock was the extent to which Republicans allowed themselves to be co-opted by Trump’s culture of corruption, greed, grift, bigotry, racism and misogynism. When they realized they wouldn’t be punished by their voters for holding such abhorrent views, the adopted the whole approach. The Republicans were the guardrails that failed. Trump never changed a bit.
I think this is the point @Ann_Hedonia was making, and it’s a valid one. I don’t believe you can have a meaningful or honest discussion of one entity (Trump) without considering the other (the Republican party).
As for the question I posed in the title of this discussion, the Republican party was well on its way to corruption, greed, grift, bigotry, racism and misogynism years before Trump. But in Trump, they found the perfect vehicle to complete their transformation from a legitimate political party into an aspiring authoritarian regime. They were not afraid of him. They reveled in him. They never cared how many principles they had to sacrifice at the altar of single party minority rule.
Now Trump has become a liability and they’re looking for an offramp. They have a new poster boy – and he’s even worse than Trump.