I would suggest that teachers show their students concrete examples of the negative effects of the actions that gangsta rappers glorify.
“San Francisco has always been my favorite booing city. I don't mean the people boo louder or longer, but there is a very special intimacy. When they boo you, you know they mean you. Music, that's what it is to me. One time in Kezar Stadium they gave me a standing boo.”
“Growing up where I did, the thought of working on a television show or in a movie... that existed on a parallel plane, you know?”