I've read lots of Thomas Sowell and other black conservatives and remain a fan. I definitely think things like single motherhood and an overall bankrupt culture, and a complicit media and policies contribute greatly to the disproportionate levels of violence, if we want to focus on that one area. There will always be exceptions to the rule, bell curve, and it's unreasonable to expect someone like Sowell to wade into the Nature part of the equation, but the total focus on Nurture doesn't quite explain things sufficiently