is not that bitcoin able to change the state of its users which effects also on the state of the country's economy, why even banned hemzzz 
Bitcoin may be a threat for a country, government has no full control over it and the only way they could do is to regulate it. Bitcoin might be use for illegal transaction, through this people may do anything they want anonymously with intervention of anyone even the Government. Bitcoin has decentralized feature and government has nothing to do with it.