This has been understood and we would not listen. Maybe I should say we couldn't hear it. The lines on madness from Apocalypse Now are appropriate because they want to burn down the house. Trump is going where the power is and that's with his base. We're still looking at this from a rational, Enlightenment place and it doesn't work.
The Southern Strategy has played out and Republicans have won with over 50 years of systemic race-baiting. Heather Cox Richardson is the most familiar source on it but there are others, both journalists and academics. Republicans saw that if they added the Wallace votes to what they had they could win. All they had to do was sell their souls.
I have a short list of articles and videos (Bill Moyers and American Experience and Ken Burns, for example) that get at it, not as analysis but as observation. There's no analyzing this. 'Everybody has a plan until you get hit in the face' doesn't apply to Democrats. Democrats keep getting hit in the face with electoral results and they don't learn.
And it's too late now.