Interestingly there's been a few party shifts. It's not just one direction.
For example, Reagan was pretty pro immigration and pro vaccination. Before 9/11 Republicans were the party of immigration. Even Trump in 2016 was the pro-LGBT candidate, that's certainly shifted dramatically. "Donald Trump said I could take a pee anywhere in the Trump facility, so I am going to go take a pee in the ladies' room."
One thing I'd give republicans is they are far more responsive to their base vs the democrats.
But yet here you are.
> There is no room for discourse or nuance.
Try me!
> If you voted for Trump you are a fascist and a pedo and nobody wants to hear your thoughts.
On the contrary, there have been endless articles and discussion about Trump supporters' opinions, to the extent that "New York Times Interviews Twelve Trump Supporters" [1] [2] is a bit of a cliche. I think that your (collective) thoughts have been well expressed and understood by the other side, it's just that most people find those opinions unimpressive, mostly couched in a sort of hero-worship credulity or open hostility to people who are different from you.
> Some opinions that would have been demonstrably in the Clinton/Obama administration would be considered MAGA now.
Sure, public opinion shifts. For example, Republicans used to be the party of limited government and law-and-order. Then they elected a felon who flagrantly violates the Constitution (14th amendment, separation of powers, emoluments clause, etc) and has worked tirelessly to extend the power of the federal government, in the present case to intervene in the Constitutionally-mandated state right of operating elections. Of course "people used to feel differently" is not, on its own, an argument in support for the administration's policies, so I hope you can do better.
[1] https://www.nytimes.com/series/voters-voices-trump-administr...