Humans are capable of handling their own finances. We all have this ability. Government are incapable handling its finances.
Government is an entity that isn't self sufficient, and the elected members of that entity have a vested interested in ensuring its survival and continuation. When they begin to control monetary and fiscal activity within its borders, it becomes an unsustainable balancing act where the cards eventually come tumbling down. Whether it be due to overregulation and centralization of authority, (think consolidation of economic matters away from the constituency and into the hands of bureaucrats/government agencies), corruption, money printing, etc, it isn't possible for the government to manage monetary/fiscal activity without disrupting economic growth.
The amount of "man made recessions" I've seen countries go through, with no fault of their own citizens, is palpable. I suppose in a democratic republic, the voters are they themselves to blame. After all, they elected the government body! But I like to give more credit than might be due because while people understand basic economics, they don't understand governance and bureaucracy.
While I agree that humans have an inherent capacity to manage their finances, Im not sure it's fair to paint all governments with the same broad brush! There are indeed governments that struggle with financial management, but there are others that excel in it. Admittedly, governments aren't self-sufficient entities, but isnt that the problem of it? Governments are of the people, by the people, and for the people. And isnt their continuation an indicator of a working system, albeit flawed?
The point about governments managing monetary/fiscal activity disrupting economic growth - its a double-edged sword. Yes, government intervention can lead to recessions, but isnt the absence of it equally detrimental, causing economic inequalities and rampant capitalism? The underlying assumption that people understand basic economics but fail to grasp governance and bureaucracy is, in my opinion, somewhat dismissive. Isnt it more a matter of access and education than inherent understanding?