Public Enemy educated black communities to Fight the Power of oppression and let them know they weren’t alone with songs like 911 is a joke in your town. NWA told people to Fuck the Police, not because they were proud hardcore criminals, but because they were tired of oppression and police brutality. These are just two examples of many.
When rap became popular in the 1970s and 1980s, rap artists, such as Public Enemy and NWA, included lyrics that shed light on social issues: violence, police brutality, lack of upward mobility, etc. Other rappers, like Queen Latifah, rapped lyrics of empowerment.