The governments can't control Bitcoin because it is decentralized. It wasn't made in favour of a centralized system where one person or authority can have full power and control over its transaction. The farthest the governments can go is to impose regulations on Bitcoin transactions especially on the exchange sites.
It is true, blockchain technology is currently prioritizing decentralization so that no one has the authority to rule and every user has the same position and is convinced of the fluctuating value of bitcoin or cryptocurrency. Moreover, bitcoin was originally created for such a purpose where every user has the same rights without any third party influencing the rules of the transaction (P2P network). There is the little fact that we can adopt the concept of blockchain technology by having central authority over transactions, and still have data security and transparency.