I think he's more a result, a symptom. He's simply taking advantage of a pre-existing condition. He's shameless and needy enough to play to their fears.
As far as I'm concerned, the Right has some perfectly legitimate grievances, particularly at the cultural level. The problem is, the voices they trust (the various media pundits from Tucker to Hannity to all the rest) have manipulated them with such myopic, paranoid, hyperbolic overkill that the grievances have been amplified by a factor of a zillion. And that's how the approach every issue, with this bizarre, overzealous, Neanderthal zeal. MTG is the poster child for this. War. Mindless aggression, Dunning-Kruger on steriods.
So while I have several general agreements with them, I sure as hell disagree with their approach, and fear it will lead to one fuckin' historic pushback in response.