After all, in OK or MS you need a car, which is a $2000+ asset, just to even access any public space or resource or make yourself visible at all.
There's much more poverty in those places, but it is hidden away. You can see a slight bit of it at gas stations that are walking distance to poor areas, but for the most part, those are the lucky ones, and the unlucky ones are walking distance to nothing.
I would much rather be destitute in a big city where I can access all kinds of formal and informal resources like temp agencies or subways to sleep on, than in a rural area where I am totally dependent on rides to anywhere.
The advantage of the rural poverty accrues solely to the wealthier, who don't have to look at the poor as much as the urban wealthy and middle classes do. And perhaps that is why we are kinder (well, ok, slightly less unkind) to the deeply poor here, because we actually see them regularly rather than having locked them away so securely we can actually trick ourselves into thinking we don't have them here.
It is deeply ironic that you came to the opposite conclusion by accepting superficial appearances. The trick of hiding the poor by means of car culture sure worked on you.