I think that fear is the main factor that prevents government from having positive emotions towards btc. They don't want to change the system that looks stable for them. To my mind, in the future most governments will accept it
Bitcoin does have great power so the government is afraid that it cannot control it and that it will have a negative impact on the country. from what I know the government is afraid that Bitcoin will be misused to fund terrorists and so on because the Bitcoin system is peer to peer.
Bitcoin is also still not stable so the government is afraid that many people will suffer losses if they invest in Bitcoin. but if Bitcoin develops and the government knows what to do with Bitcoin then one day all countries can legalize Bitcon.