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 with you.
Besides, while banning Bitcoin some governments claim it is connected to money laundry, drugs, terrorism or other illegal activities. But governments are eager to use beneficial tech like blockchain for revival and modernization of banking and financial systems.
Therefore, it seems governments are kin to restrict individuals from using Bitcoin or impose taxes on it, but they are ready to get their advantages.