Have you attended any of these shows or listened to any of these recordings ?
Bands like Galactic, Greyboy Allstars, 20th Congress, Garage A Trois, MMW, Govt. Mule, Critters Buggin', etc. are all about music. Some of the most talented musicians in the world play/played in these bands -- a lot of them with serious genre-hopping chops and deep roots in jazz. This is a generation of players who had the talent but not the desire to prove themselves in serious jazz circles before venturing into other realms. Some of them in fact did prove themselves (like John Ellis in the T.Monk competition), while some of them didn't bother even though they could have.
They had a maelstrom of diverse influences coming up, saw how confining serious jazz had become (with every note you play over-analyzed by the critics in terms of 50+ years of historical context -- what's the point ? ), and chose to express their take on life and our world in a different manner and make an impact in a new direction.
I remember seeing Hunter 12+ years ago when he was surviving off $4 gigs: he was playing Monk, Mingus, Young, James Brown, Marley, Led Zep, Nirvana ... the list is endless ... and it was all good.
Commercial rap in contrast has far less to do with music as a societal force than it does with image fabrication and materialistically-based hierarchical promotion of vacuous egos to those who seek the same.
In a very real sense, commercial rap has become the epitome of capitalism.