Question

reasons for adopting democracy in libya egypt nepal and bhutan

Answer 1

The answer is similar to advantages of democracy

Answer 2

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.