IMO, it's a matter of tradition, bolstered and perpetuated by geological and self-induced isolation, both factors of which supports and sustains the other.
It seems to me that a lot of folks there, as well as in many other rural isolated areas of the nation, like things just the way they are because it gives them stability and a sense that their futures are predictable and in their control. As far as I'm concerned, there's absolutely nothing wrong with that as we all like to feel safe and secure, socially and economically. The difference again, is isolationism. It promotes statism/micro statism. In contrast, we have those big population centers with diverse communities where constant exposure to different cultures creates an atmosphere of constant change as the assimilation and adaptive processes are in constant motion. Therefore, change, to a certain extent, is much more palatable and easier to embrace. Maps showing voting trends clearly support this.
As we all know, the Repubs are masters at exploiting these fears of change and loss of control, and with Trump fanning the flames of fear and hate with a yuuuge flame thrower all during his election campaign, well, it was easy for him to provide the salve (in the form of a highly concentrated dose of snake oil placebo) for the very fears he was histrionically frightening his hypnotized audiences with.
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Increasingly so, that salve is turning sour and has already exposed much of what was empty promises in the form of bait to lure his willfully ignorant catch in with. The apologists are out in force and attempting to forestall/snuff out these small outbreaks of fact checking and alarm bell ringing in order to prevent these small ripples turning into an unstoppable tsunami of proof driven allegations that will sink Trump's apparent emerging efforts to militarize the population just like Bush and Cheney did.
I'm still being hopeful that Trump proves me wrong, but the trend line he's on is making me feel I'm right.