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.
That is actually what makes Bitcoin and other Blockchain Technology integrated Cryptocurrencies great. Being uncontrollable by the government and having its own growth development is the best for Bitcoin. Imagine Bitcoin having some unfair regulations about it, it will surely gain more value (or decrease) because of the fact that some things gets more value even though its being labeled badly. They just need to fully understand what are the capabilities of Bitcoin and the whole Blockchain technology.