Think about social changes that have taken place in recent history -- the civil rights movement, changes in gun regulations, the Arab Spring, etc.. Can you think of ANY that have not been preceded by some level of violence? Is there nothing short of violence that provides sufficient motivation for society to implement significant change?
Does violence ALWAYS lead to change, or does it sometimes PREVENT changes that might otherwise take place? Does violence sometimes lead to undesirable change?
Is violence ever a justifiable "tool" in seeking to implement social change?