The answer is similar to advantages of democracy

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Influence of western countries and democratic countries on the people of those countries. Gradual increase in the people's and media's support for democracy. 

The atrocities of earlier rulers and/or inefficiency of administration. American and French attacked Libyan forces and brought it in control.

People's revolt against ruling power and stepping down of kings in Nepal, Bhutan in a peaceful transition to democracy - not complete democracy yet.