no government is scared of bitcoin .

one of government roles is to protect its citizens .
if in a specific country there is large percentage of stupid population , they need tighter control  
it doesn't matter if its drugs , alcohol or bitcoin .
if the government believes those dummies that invest in imaginary internet money will find themselves on the street one day , and become a burden on society then they need to control it .

my country did not ban bitcoin , but casinos and gambling is banned .
casino can make lots of money in taxes for the government . but i guess we have large percentage of stupid population that can burn all their money in gambling and become a burden on the rest of the normal population.

government control is not always bad .