Try it again - let's look at percentages; and especially percentages of artists/albums who are selling on the rap charts. The overwhelming majority of them are by artists who are mired in the gangsta-thug-criminal-mysogynistic culture that people percieve.
Ten to fifteen years ago, the animals who are populating the charts now would not have made it, nor would their antics been tolerated on a large-scale basis.
And if I hear that 50 Cent "It's yo birthday" bilge on my car radio again, I'm gonna rip it out of my dashboard and chuck it out the window. I'm sorry -- that's not even music, it's a moron who was too dumb not to die when he got shot babbling into a microphone.
They're making money and we agree that they are animals. Appealing to their "good side" isn't going to work. Parents are allowing the music in the house. I don't see how it can be countered.