that is probably part of it sure, but poor mothers are also louder and harsher with their language most of the time. And you know that these children are not being told "you can do anything you set your mind to" at home. Which is a worse problem than the general breaking of the children IMO. What happened to these parents wanting more for their children. They then think the only way that they will have more than their parents is by being a rap/rock star or sports figure because that is the only people they see making it big other than drug dealers. Kids not being encouraged to chase dreams is the larger tragedy IMHO.
And it is easy to generalize this to the black community but that is also a numbers game. We see it here more and in other cities because that is the largest poor community but there is no doubt that the same thing goes on in poor white neighborhoods in other cities and rural areas.