It's Vance because Vance is one of us, as odious as he is, selling a story for all of them.
He's a poor, who told rich people, that the problem really is the poors. That poverty in Appalachia really is all the poors' fault. That the American dream works fine, it's just that you're lazy and drink too much and accrue too much debt and blame someone else for all your problems. It's your fault you're poor, it's not capitalism, in fact capitalism saved him.
And that sells well in affluent circles.