Bitcoin is reducing unemployment a bit and also creating job opportunities. May be thats why.

No its not a major or minor related to it. Infact its a major concern for government because chances of misusing can be high. Already all the government of the countries have enough work to take care of it and why they would like to take on additional work and create laws and keep a track of some thing which can be easily ban and get rid of it. Due to which it has already ban in few counties.

It has huge advantages too but I dont think government would be much bother about it.

Many countries want an out from the USD based hegemony that has existed since Bretton Woods and intensified since the petrodollar scheme, but want to get out as painlessly as possible for them.

I think you'll see countries take a variety of different tactics with BTC and other cryptos.  Some will ban, some will regulate.  Many will tax, lol.

First of all, I don't think that governments are very good in working together.
And then I think that crypto currencies are a problem mainly for those governments, where the crypto currencies are used the wrong way.
There are many examples like Japan or Switzerland where the crypto industry fits perfectly into the economy.
Those governments have no reason and no interest in banning bitcoin.
In China on the other hand many people got scamed with ICOs and the people use bitcoin to move bigger parts of their money abroad.
That is harmful to the economy in China, and I can't blame their government if they think about ways on how to contain that capital flight.

Legally speaking, some countries tax your bitcoin and not disclosing possession is tax fraud. It is up to the individual user if they think they can get away with it.

Bitcoin is the first decentralized P2P network that is powered by its users with no central authority or middlemen. That is why government is afraid in cryptocurrency because of lack of central authority. Government has control over fiat currencies. This control will lose when non-government entities create their own currencies.

The governments doesn't make bitcoin as illegal worlwide because there is no clear proof that bitcoin is crossing any law and making bad effects to the people. They don't have any proof that can make bitcoin as a bad looking currency because bitcoin is a really good currency and most of the people are now using bitcoin so they can't do anything about it but to just accept that bitcoin is slowly revolutionizing and accepting bitcoin is one of the things that they can do to adjust their system.

The government is the body of corrupt officials who do not want legcoinized because they can not benefit from it. But if the changes for many years may not be comfortable for us. They will adjust and control us and it has a price like what I know. Taxes are made and even our identities are public and that is never good.

But I still have one question in my mind that many big countries have accepted bitcoin as their legal and regular digital currency like japan. Australia, and so on Vietnam is also in this list and recently I heard that Russia is also going to legalized bitcoin in Russia. Now what will you say about this. There is a conflict between the nations to legalize bitcoin or not.