Given the nature of the market and Bitcoin's features, they are preferred to have a technology that they can control and urge people to pay taxes which is likely impossible with Bitcoin.
If the government could find a way to control the bitcoin supply, they might be more reluctant to adopt it but since government can't produce bitcoin just like they can print the paper currency, they will never adopt bitcoin.
Bitcoin is inflation-free while the government likes the currency which is inflationary in nature.
Finally, people can hide bitcoin in their wallets and save taxes, this anonymous nature of the currency is also disliked by most governments and nations.