Crime rose because the CIA allowed guys like Manuel Noreiga, and other Central and South American right wing dictators to export crack cocaine into American cities.
The Great Society gave blacks opportunities to get into colleges and universities that had been barred to them. Blacks used ALL of the opportunities given, becoming doctors, lawyers, and accountants, and building today's black middle class.
It's going to be really ******* difficult to sell middle class blacks on the notion that they're dumber, less moral, and less deserving than white middle class folks, or that their votes should not count.
Black people have watched as all white Republican state legislatures disinvest in communities the moment minorities take over a city government. Republicans declare the city government "corrupt" and refuse to provide funds for infrastructure, or schools, as such funds will not be used "properly". See water problems in Flint Michigan, and Jackson, Mississippi.
Then there's the "over-policing" of black communities to milk the residents for "traffic violations" and the fines that result. See DOJ report on Ferguson Police Department in the wake of the Michael Brown shooting.
Republicans complain about black fathers being "absent" from homes, and yet given everything successful federal governments have done to separate black families since the first slaves arrived on your shores, is disingenuous at best.
This line was used continuously by the Reagan Administration even as his administration's "Zero Tolerance" drug policy imprisoned more young black and brown men in the inner cities, just for possession small amounts of pot, right at the age when they would be getting married and starting families, than in American history.