Basically for the same reason rappers are obsessed with gangsta shyt and black on black violence.
Peer pressure by their peers, encouragement by that community of gangster rapper and those who live an extravagant lifestyle such as ballers and celebrities.
^^^That's just on a basic level.
Deeper, it helps those who are in power stay in power by keeping those they control from rising any higher in class.
Prison industrial complex needs cheap labor. Needs prisoners. Needs stupid nikkas killing each other over fukking each other wives. Needs you nikkas doing and selling drugd. Needs evil bytches like Hilary to keep making laws to keep nikkas in prison and the same stupid nikkas are voting for that bytch. She'll be the next president, will set blacks back even further than Obama did and the cycle will repeat itself. If not through her than Trump. Cause nikkas are too anti-semetic to support Bernie.
This white supremacy got you nikkas thinking fukking each other's girls was your idea. Nah nikka. Wake up.