This is exactly why we NEED government and regulation
You can't have it both ways. Bitcoin was explicitly invented as a way to exchange tokens of value outside of any regulatory system. Either a money system is outside of the government or its inside of the government. If you have all the functions of government private property rights and justice system involved then there is no need for a decentralized blockchain. It would be a waste of time. You can go one way or the other way, but you can't have both.
currently there is decentalized govt regulation, because there are many countried that has acknowledged btc, allowed it to exist, may have even classified it, and have made some rules pertaining to it.
In fact, the US govt is not just a rule maker of btc they are also a btc holder, one of the larger holders I might add