Well hip-hop is my favorite genre of music after jazz. Obviously you've never heard the song "Excursions" by A Tribe Called Quest.
Maybe the average commerical rap listener doesn't want to. There are many rappers who don't talk about these things, and I prefer to listen to their words more than people like Lil' Wayne and 50. Hip-hop isn't just entertainment. It's an art form. Maybe you should research WHY hip-hop was started. Inner city schools cut their funding for music and arts, so the children of the streets created their OWN type of music.