Answer: Mother nature imposing low intelligence and poor impulse control.
Actually, it’s the fact that such behaviors have their consequences alleviated at the cost of others through the government.
When such behaviors result in negative consequences,
those behaviors tend to diminish,
regardless of “mean IQ”.
People respond to incentives, which is EXACTLY what they are doing now. The males tend to pick the females “with the best papers”, ie, the most gov’t benefits.
Certainly, misguided social engineering plans like The Great Society and subsequent programs made things worse. But their own personal weaknesses relegate most blacks to their present conditions. The only solution to improvement of blacks is to try and separate the Black Underclass from the rest of American society and diminish their numbers.