At some point we need to cut these people loose, understand they’re beyond saving, and move on with things.

Oh how I wish we would be able to split the country and not have to deal with the deplorables any longer. Unfortunately we would also have to split with the deplorables the national debt and the nuclear arsenal. Imagine what would happen then…

While that sounds like a solution it’s of the “simple but wrong” kind. Just like you, they are product of propaganda, though theirs is less based in reality than yours. If you don’t counteract the source strategy (like the lack of education, biased fox “news” and adjacent media), nothing prevents it from being repeated in the resulting halves of your solution, Zeno style.