If not for the likes of Malcolm X, reverent MLK would not have mattered
Anybody wants to bet against the notion that the white establishment only moved toward ending segregation, providing civil rights, and all that jazz because of fear of the radical violent black movements, not because of the peaceful ones?
The USA is not England, where Gandhi types can (eventually) shame the establishment into change.
Just like it took violent Maffia connected people like Jimmy Hoffa to extract basic humane working conditions for the trucking unions (working conditions that were already the norm in western Europe) and a Civil War to force the end of slavery, it took violent unrest in the 50's and 60's to force the passing of civil rights and the end of segregation and Jim Crow. Sermons and speeches of rainbows and unicorns alone would have accomplished nothing.
The only exception would be the gay rights movement.