It's pretty common for people of high intelligence to keep their mouth shut more often than the average person, especially when they're in a socially precarious situation. "People" of low intelligence on the other hand...
So, are they better off when the dad doesn't stick around, or not? One the one hand, they get raised by a black woman who may have only made you for the gimmedats. On the other hand, you might be raised by *two* blacks, doubling your sources of abuse.