Well, it's just a theory, so I don't know if it'll hold up to scrutiny or not. But I always figured the niggest traits are all correlated -- low IQ, stealing, poor impulse control, violence, etc. So if you're really, quintessentially black and have that bundle of traits in excess, you're gonna hang out with a crowd more similar to you -- dumb, violent, etc. And because you're impulsive and violent and run in this crowd, you are disproportionately likely to be the victim of violence as well. You also don't know how to cooperate with police because of the poor impulse control, so when you get caught stealing or whatever you're also more likely to die as a result. Come to think of it, you're also more likely to mate with someone with poor impulse control and have your offspring aborted. All of this must be a tremendous, grinding selective pressure which would highly disfavor these maladaptive traits. Thus, the survivors that pass on their genes to the next generation are more likely to be those that are comparatively less violent, dumb, criminal and impulsive. No other race faces this level of selective pressure. We lead remarkable easy and safe lives within our current civilization. Given those circumstances, it's possible blacks may actually pull themselves up towards our level by murdering each other. Though it's possible a different outcome could occur -- such as maybe selection favoring not only intelligence, but also extreme lethargy, so that the tendency towards lethargy outpaces that of the tendency towards intelligence.