My country banned this system because cryptocurrencies have no control by government. I think this system is unique system for all and civilian have control full of freedom.
But why bitcoin is helping economy in many ways, first you pay tax and filling your country's pocket and second when you exchange bitcoin to money you spend that money and again you pay fees.
Without bitcoin you will spend less money and your country will receive less tax, stores will receive less money and it is all connected to each other.
I really don't see any good reason to ban bitcoin.