The limitation of riots, moral questions aside, is that they cannot win and their participants know it. Hence, rioting is not revolutionary but reactionary because it invites defeat. It involves an emotional catharsis, but it must be followed by a sense of futility.
Human progress is neither automatic nor inevitable. Every step toward the goal of justice requires sacrifice, suffering, and struggle; the tireless exertions and passionate concern of dedicated individuals.
I have a dream that one day every valley shall be exalted, every hill and mountain shall be made low, the rough places will be made straight and the glory of the Lord shall be revealed and all flesh shall see it together.