^That's becaue what they're singing is Progressive Hip Hop, as opposed to main-stream Hip-Hop, which these days resumes to either Gangsta Rap or Crunk.
Where's East Coast, Dirty South, West Coast, G-Funk, Miami Bass? They should be out there on the shelves, but instead they went underground, because the media would rather tell of riches and idiots, because comedy, dirty words, violence and kicking back have been taken care of by other tv shows.
EDIT: Oh yeah, and nobody wants to hear about the problems in the real world, which is what Progressive Hip Hop is all about. Although it's one of the best genres to come out of the Hip Hop current.