You might probably looking at it in the other way. The government is not against or concerned in decentralization per se but the ones involve with it. If you have seen in the news already the problem the government is having on regulatiion is not about the cryptocurrencies itself but the criminal activity involve with it. Having a decentralized cryptocurrency circulating around the world made it enticing to a lot of criminals to take advantage of the situation and until now they are profiting from it. The government is facing a dilemma on how they will handle such problem at the same time their citizens can freely benefit from these cryptocurrencies.