Point A government's sets bitcoin bann not because they know what bitcoin is and what the bitcoin is, the government is told what it is bitcoin and so on but the government keeps claiming bitcoin as a threat to banking.
Point B government claims bitcoin as a tool to launder money.
Point C government see unstable prices
Just opinion
I agree and support several reasons stated above.Because bitcoin is not controlled by the monetary authority that is central bank, the government must issue or create formal law and regulation relating to bitcoin operation.Under this law
government must be able to controll and try to minimize negative impacts like money laundry, terrorist funding, illegal drug and or weapon purchase, etc. The government also can collect taxe from investment gains which can support the country economy.