A lot of the issues you're talking about were around before rap even went mainstream.
Don't get me wrong. I know there's been negative influences when it comes to certain rappers and trends. I don't think anyone can deny that.
But the breakup of the nuclear family was starting to become an issue in the Black community as far back as the 1970's and, if anything, the Crack era played a much bigger role in accelerating it than rap. And broken families on top of socioeconomic issues play the biggest role in many of the issues you're claiming even though rap is often a convenient scapegoat due to how visible it is.
Believe me, though, the biggest influence on street dudes is other street dudes engaging in BS. Baltimore doesn't have a thriving rap scene in the slightest but still has tons of major issues in the inner city because of things unrelated to rap. Ditto for Detroit. Ironically, the biggest rappers from Detroit weren't gangster rap at all: Eminem, Big Sean, Danny Brown, J Dilla/Slum Village, Royce, Sada Baby, etc. yet Detroit still has a number of inner city problems that goes back for generations including when Motown was still popping.
Of course, nobody's going to talk about how the rapid decline and offshoring of certain industries like the Automobile industry on top of drugs, broken homes, and poverty played a major role in inner city Detroit's or inner city Baltimore's problems but it's easy to point the finger at hip hop and make a bold claim that these issues would've been resolved if rap never went mainstream in the Black community.
Taking away rap(especially negative rap) might lead to a handful of positive changes but, overall, things wouldn't be all that different as you'd expect. There's a reason why reparations is gaining popularity. There's some things that are both self-inflicted by our own community or a result of a shytty government that still owes us.