I agree SirNose. Case in point:
My undergrad degree is in Social Work, and for my internship, I had to counsel kids with behavioral problems at school. One kid was a black teenage male who was getting ready to graduate high school. When I asked him how he felt about it, he told me that he was depressed about it because now he wouldn't have anything to do except hang out on the corner.
He actually said this to me, and he was actually serious. It broke my heart.
It wasn't that he was just choosing not make something of his life; he didn't even understand that he had options.
People are products of their environments, and for people like this kid, they have a skewed sense of reality because it's based on whatever they see on television. We have to shield our kids from negative influences, and make sure that they have positive role models in their lives if the cycle is ever going to be broken. Unfortunately, these are the kids who grow up to have kids of their own and perpetuate the cycle, so intervention is usually needed from outside sources.
I grew up poor, and I am thankful to my JW parents for at least shielding me from stuff like rap music and drugs. Although they discouraged me from going to college, I went to a magnet high school where the atmosphere wasn't "are you going to university" but "which university are you going to?" I credit that with my decision to go to college, and that's why I believe so strongly in making sure that we provide the right environment for our kids.
You're right: they're not going to get the right message from most mainstream rappers and athletes, and unfortunately, probably not their parents either because that's usually where the problem originated. That's why positive black people need to be visible and vocal so that our kids can see them and realize that there are more options than what they see in rap videos.