Why is the state afraid of crypto currency?
What is the reason for such a cool attitude on the part of the state? The absence of central regulatory bodies is the main reason why governments are afraid of crypto currency. What is behind this fear? Let's try to list its main components.
Money is an instrument of control and political influence
Governments control the traditional fiat currency. They use central banks to produce money from the air, using so-called monetary policy. They also dictate the rules of the banks, allowing them to monitor the movement of currencies, and to some extent determine who gets profit from this movement. When the private currency appears in the arena, the state loses all these levers of influence.
Since central banks can increase or limit the amount of money circulating in the economy, in order to stimulate investment, create jobs or prevent inflation and recession, currency control raises a fair concern among specialists.

They fear bitcoin because they cannot control bitcoin and also because they have not found a way to put taxes on bitcoin and therefore they are not making any money from bitcoin.

Bitcoin is taxfree, obviously almost all governments use these taxes to make money and they have no control in bitcoin because of its decentralization. Some government says they fear that financial misused may hapen to their citizens but personally, I doubt it.

I think the government's fear of bitcoin is one of them for fear of investing into bitcoin can reduce investment into the national real sector and also used by irresponsible people

I don't think government has much against it except the fact that cryptocurrencies makes it easy for people to send a country's money abroad without their permission. Since government cannot regulate this market hence they feel the pressure of not being in power. Why would any government want the users to have all the power. They obviously want to be in control and dictate people's lives.
Only a handful of countries recognize the true potential of bitcoin and other cryptocurrencies and have already made amendments in their laws. Japan is one such country which is extremely friendly to bitcoin community. Apart from that no other government is willing to make it a legal tender. I hope that government stops fearing bitcoin in the future and accepts it as a legal tender by understanding its true potential.

Government fear bitcoin and not just them, also banks.
Bitcoin has a system that no one can control, no government nor banks.
Bitcoin is designed for every people in the world, we humans are the first handler of this coin and the system revolve around us.

I don't think so. It's silly to fight with drugdealers just banning Bitcoin. Everyone understands it. Actually I believe that they are just afraid to lose their control over financial sector as it is slowly becoming more and more decentralized. That is why a lot of banks now support and use Ripple, and these are not private banks, but also those that belong to a government, such as The National Bank of Abu Dhabi, for example.

A ban is never a good thing, but people have the power to protest against it, but they rarely do. The government that bans something is always afraid of it. If your government doesn't want you to have guns it means they are afraid of an uprising. If they are not allowing you to freely exchange local currency, they are afraid of people getting rid of it, moving their assets abroad. There's always an explanation and nothing is being done without a reason.

I personally don't think that any government fears Bitcoin. Bitcoin is just an experiment, while the real brainchild is the blockchain. It is the blockchain that shakes up the old foundations of fintech. The blockchain really disrupts the way information is accessed and stored.  Instead of a private ledger that could be doctored to misrepresent it's true value, blockchain is a publicly available transparent ledger, not controlled by a centralized authority.