"The Bell Curve" points out that cognitive skills is a combination of heredity and environment. Having said that the authors took great pains to point out that that fact says nothing about an individual.
One of the problems is that if you pin point heredity, then you open up the argument that it was white slave owners who bred the lower bell curve into them. I dont’ think we ought to engage in that type of argument, rather stick to the argument that “The Great Society” program has not only failed them, but is leading them down an evolutionary dead end.