Detroit and Chicago are only 2 cities though where are the stats for black on black crime on a national level from the 70s and eras there after?
furthermore the 70s is the decade which birthed the culture of modern thug culture(including gangsta rap) which pervades the black community today...while gangsta rap hadn't emerged yet the same glorification of of ignorance and criminality so prevalent gangsta rap was still promoted to blacks though more so via blaxploitation films(such as" The Mack," Black Ceaser, " "Black Godfather,"etc) which promoted thugs whom preyed on their own community as heros
in addition to pumping dope into the hood the CIA simply took the formula it created with the pro black thug lord blaxploitation films and used gangsta rap to further spread their message of black on black self destruction and self hate as well as reinforcing negative stereotype of black savages to the masses.