Rap may be a fantastic outlet for "political" expression (not that I think it is) and still be execrable as a form of music or even as a way of declaiming verse.

Spoken like a true Folky!

FYO : Rap is far more complex / exciting / sophisticated / rooted / involved / traditional / dynamic / relevant / diverse / wondrous & musically satisfying than the bland retrograde easy listening pre-digested toothless excreta that gets passed off as Folk these days, which is well and truly execrable and a disgrace to the bucolic joys of the traditional song / music forms which it claims to revive and revere.

Folk is heritage hobbyist comfort-blanket banality created by & for a select elite of comfortable middle-class graduate escapist nerds; Rap, OTOH, is actually happening and celebrating the human condition in all its filth, depravity, pride, yearning and struggle. It speaks from the human core eternally.