FWIW my very aged MIL, despite being a lifelong D supporter, is also finding RW propaganda or at least RW JAQing more acceptable for lack of a better term as her short term memory declines. The simplicity of the story, the repetition of the punch line, and the absolutist tone tends to stick with her while all the details (if there even were any given) drift away like so much cigarette smoke in a typhoon.
She also is much more susceptible to “the sky is falling; the market’s about to crash!” snips on CNBC, FNN, & such than she was a couple years ago. Again the chosen narrative is simple, the conclusion is repeated and emotionally resonant, and the details are seemingly too arcane to actually matter, much less remember.
Kinda like dogs who don’t understand English, but do very well understand human tone of voice and emotional state, more and more the parts of the message that get through to at least my MIL do so by means other than a dry transcript of the facts.
Best of luck to you and your parents as the rest of their game plays out. We’ve been lucky so far that our drama has been limited. But I hear the waterfall in the distance and it’s getting louder.
Here is a thread I started on a similar topic from 3 years ago that may be of some value: