On the one hand, worrying about the success of Bitcoin will affect the government's control over monetary policy, so it is hoped that it can control or limit its development. On the other hand, as long as the Internet exists, Bitcoin can hardly be banned if Bitcoin is the last in the world. With success, the current controls will put a huge price on their nationals.

Yes indeed some government fears at bitcoin, each and every countries has their own reasons why they have a fear of bitcoin. But base on what I had read in different kinds of articles the most popular thing why government have fear in bitcoin is that this can be used in illegal trades or transactions which no government wants to have in their jurisdictions. This is also the leading cause or reason of some countries on putting in ban bitcoin in their land. For me this must not be blamed with bitcoin because they are just doing their job to serve people. What must be apprehended here is those people who are using or doing illegal trade or transactions.   

Government fears bitcoin because this new technology is very hard to control. Officials like to take care of everything they can but they can`t for now control e-currencies the way they do with money and gold, silver etc. They try to point out that virtual currencies are used for crimes like drug dealing, human trafficking, child abuses, money laundering but if so then they forgot the fact that criminals still use ral money for commiting this and other crimes!

I think the government is actually scared bitcoin. Because, like all other countries, my country is not developed and people are unaware. In our country, this bitcoin works in the ordinary people are benifited very financially. And I do it, but the country's government says it is an illegal transaction and a means to steal money. In this way, the government is afraid of bitcoin and it is a threat to us who are doing this bitcoin.

Government still has fear on what they cannot control thats why they want to control the use of bitcoin.It could be one big advantage financially and can improve revenue for the country.

Bitcoin gives people freedom from the financial system, and the government does not want to lose control over the flow of money. We need to find some kind of consensus.

Bitcoin is decentralized and it important to enhance the world in investment and attractive people. Govt. fears with BTC because Govt. have no control over it, Govt. can not take benefit from BTC.

The government is currently very concerned about bitcoin, as the need to find a new way to hedge its wealth is mounting, as governments are increasingly fiercely opposed to traditional banks, by law. Anti-money laundering, forcing the bank to provide sufficient customer information, the use of electronic money to hide foreign assets are rapidly evolving, Encryption makes it very difficult to find traces.

some government ban bitcoin because the reason is want to regulate bitcoin and get put an revenue tax collection second reason have many bad news for bitcoin as decentralized currency, EXAMPLE are follows use of terrorist, use for criminality, use of drugs syndicate  and many other's reason but didn't thinking the good side bitcoin how to help to the people accepting virtual currency.

actually you have an point of view as decentralized currency government didn't know how to control and regulate bitcoin because is using new technology so government need to ban for a meanwhile because officials want to make sure how help to the community bitcoin accept in their country,
definitely after learning and knows how much bitcoin importance surely become legit currency and the fears is out.