There are several reasons for governmental actions against Bitcoin in some countries. I really believe that some governments around the world fear losing their monopoly on currency and that they will be unable to oversee financial transactions as they wish to do.
That's probably the biggest reason why so many governments are hesitant in accepting or allowing cryptocurrencies within their country: they know they can't control their blockchains or play with the transactions or the assets people hold or send because that's what they do with their traditional financial systems. They can block your transactions, confiscate your funds, block your account and ask you for explanations on your money and whatnot, and they can't do any of that with Bitcoin.
Governments know that if they lose control over the financial activities of their people or if they become able to keep and use their assets on their own instead of using them or their banks, they will slowly lose control over their people and its true. Banks are the reason why governments get so much money, especially in the form of taxes that they impose on people since they can see and monitor everything.