Whether mass civil disobedience can unravel a tyrannical government  is a difficult question to answer.  History reveals movements that have succeeded gloriously, or have failed miserably. A tyrannical government would be unfazed by any kind of disobedience. That is one aspect Much also depends on the location of the movement: what works in New York, London or Holland may not work in the Middle East, or some parts of Asia.  That depends ...