Point A government's sets bitcoin ban 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
It has a point anyway but I am sure that the government knows the bitcoin because it is a crypto currency they just hide it to their people so that they can control the flow of tax. As we all know bitcoin has no taxes be has a large transaction fee.