Why is rap, screw & chop, gangster rap nothing but a bunch of sh*T!?

when i lived up in the bay...we called the police because there was some shootout in front of our house. the cops didn't come. 5 guys were shot but didn't die. anyways there is more to rap. Deltron 3030 makes raps about space and fighting intergalactic space companies. pharcyde, de la soul, and i believe celph titled make alternative hip hop.