BTC could make people more autonomous, self-resilient, being their own bank. You can use it like cash, making your transaction almost untraceable (or untraceable using e.g. monero or dash or laundry systems) : this is governments worst nightmare, isn't it ?
It's easy because eventhough governement doesn't hold bitcoin they also have the power to earn ir in very special way. And of course governments are also using it in able to earn extra income. They will not banned bitcoin in theor country because they see bitcoin is a very advantagable thing and not negative thing.