You raise a very interesting point. And I actually thought about the West Virginia situation when typing my original post.
But there is a crucial difference between WVA and a big city such as Baltimore. WVA is mainly rural. You have maybe one or two problem children per mile. Big cities, on the other hand, might have dozens of problem children per block. They have reached a critical mass.
And here's something else to consider. How often do you hear of a poor rural black kid assaulting someone? Sure, it happens. but it's rare.
Look up Jessica Chambers for one,
And the states of Mississippi & Alabama which for the most part are rural, yet both are always near the top in crime rate.
Hell, the whole continent of Africa is mostly very rural and look at all the violence and horror that occurs there.