Keith,
The Jazz Fest has included fusion and hybrid musical styles leaning to electro, rock, folk, experimental, etc for many years. It probably does this for several reasons - to make money and reach new crowds, but also because it recognizes that to limit itself to someone's idea of "jazz" (yours?
) would be to deny the cross-pollination of musical genres has happened for decades.
You obviously don't like hip hop. Fine. Many other jazz fans and musicians do like De La Soul, who are a particularly good hip hip group.