Trump may flirt with anti-vaxx sentiment or climate denial, etc., but he can't fully support those ideas. They're very niche and he'd lose the centre if he did.
RFK Jr doesn't hold back on those issues. For conspiracy types he is closer to their beliefs than Trump.
I agree the execution of the end of GoT was bad (i.e. the problems weren't just the issue of everything needing to come to a head). There were a lot of different complaints about how GoT ended, but I definitely saw a lot about how it was all just battles in the last season and no nuance. I think that was always going to be hard to avoid given how GRRM had set up the main plot. And I think he will find it hard to avoid when writing the last 2 books, which could be part of the reason he doesn't want to do it.