I don't know if they should lose their "card" so to speak. Art imitates life. Sure some artists are bringing the filth up front, and kids are impressionable. They will pick up some of this stuff regardless of what genre they listen to. Many artists of all genres glorify some sort of ill that may contribute to delinquent behavior in children, and some adults. Rock is chock FULL of artists who have built their livelihoods off of "sex, drugs, and rock and roll". That has been Rock music's slogan for quite some time now. Generations and generations of people who have listened to rock have succumbed to the rock lifestyle, and some just listen to it even though some of it glorified drug use,violence,and alcohol. The same goes with the rappers. Some of them sell poison or market it through music, be it alcohol, cigarettes, drugs, violence, etc. Some people fall into the mess, and some don't.
I guess the term "artist" is subjective. One person's "art" could be another person's piece of shit. For example. Johnny Cash is classified by some as an artist, and so is G.G. Alin. Some people choose one over the other and feel that one may be more of an artist than the other. The same goes with Chief Keef, and Pac.