I mean... Well I'll start with I have a bit of a conspiracy theory
So old white men ran the record industry when rap got hot. Clear channel and the top record companies can make anyone a star. Notice the over arching ideals and values they prop up
Much like the CIA released crack on minorities. Record companies released drugs addiction, gang banging, spending frivolously via glamorization On minorities
Always felt like minorities were being fed values that lead to failure. This is a continuation.
De La Soul, Jungle Brothers, A Tribe Called Quest, Pete Rock & CL Smooth, Brand Nubian, Digable Planets, The Pharcyde, Digital Underground, Souls of Mischief, Del the Funky Homosapien, Freestyle Fellowship, Arrested Development, Goodie Mob, Outkast, Fugees...
Grandmaster Flash, De La Soul, and Public Enemy would be good examples of rap that was politically and socially progressive, I'm sure a bit of digging would give a long list