If citizens cannot be trusted to handle their financial affairs privately, and self-report their taxes, how can the government be trusted to run its governmental affairs privately?
If the argument for a controlled monetary system is that human nature assures misuse of a decentralized monetary system, does the same human nature not also assure misuse of a government and banking system? Anyone with more brains than gray hairs can work out that eventually humans will refuse to accept any currency, system of government, or institution that is managed by other humans. Code is the only way forward.
We must come to terms with the fact that humanity is flawed, and will never be perfect. If we truly accept this fact, any system in which any human has any granted power over another human is completely ludicrous. There will always be some with more than others, but to validate that reality through law is unconscionable from an objective point of view.
A superior form of humanity would demand open-source computer systems whose code is fully audit-able and verifiable by each individual user. Anything less is purely taking advantage of your fellow humans, and once they have all sufficiently woken up, I find it hard to believe they will be smiling back from beneath the yoke of old.