It is not clear what you are referring to when you mention "our government" and how it relates to Bitcoin. Governments around the world have varying attitudes towards Bitcoin and other cryptocurrencies, with some actively supporting their use and others taking a more cautious approach.

In general, governments are interested in cryptocurrencies because they have the potential to disrupt the traditional financial system, and many are looking into ways to regulate and oversee their use. However, it is not accurate to say that governments are buying Bitcoin in order to gain control over it or to "join" the network. Governments have many different tools and methods for regulating and overseeing the financial system, and buying Bitcoin is not necessarily one of them.