It's because they have, and show, money while being famous. They just attract more street people then others because hip hop came from the streets from day one. It was started by gang members, so what do you think is gonna happen?
Just to be a dj back in the day you needed some protection from stick up kids taking your equipment. All genres have robbers, but those type usually are extotionist like the mob, so it ain't a whole bunch of them. For nikkas in street gangs, they come by the tons!
As long as you know how to move, you won't be seen until you want to, but it's still hard because if youre a famous street rapper, people will always know where you're at, even white people. If you just keep it famous to black people, you can hide easier.
Being a SUPERSTAR is for the birds, small fame is where it's at!