I have also watched this from the start in spite of not having warmed to Miriam in the past, but thought the content would be interesting as indeed it has been, and Miriam does come across as more likeable.
They certainly know ( or did know when it was filmed!) how to welcome immigrants. Yes many Rural Americans have a very provincial attitude, backward looking, (as we can be, but mostly we accept that change is inevitable). and it being thus, you can understand why they vote against change or anything that will force them to confront the 21st (or 20th) century. I wonder if it is because the country is so big and has everything - hot and cold climates, and mountains, deserts, lots of space - they can be self supporting and don’t need to travel. More worrying is the lack of interest in learning about other countries - I suspect their knowledge of history, other than that of America, is pretty dismal. Perhaps this is why immigrants who have been able to acquire education and opportunity can do so well there, they are more open minded.
Sorry if these sound like a sweeping statements I mean to refer to the rural Americans who have no interest in travel - and in that vast country, there are many who have not left their own state, let alone their country. There are of course many open minded, intelligent people, ( Bill Bryson for one who prefers to live in England!).