The government is made out of people and if history has taught us anything, power corrupts those people. Income inequality has only risen since the last financial crisis. Decentralization of money is the whole point of this exercise, and many believe Proof of Work is superior to Proof of Stake because work is actually scarce. Once you make it cheap to transact, that opens up all sorts of attacks (spam, phishing) and devaluation. Since PoS can be copied very easily, many corrupt governments will do just that.