[smoldesu]

Our government isn't authoritarian. It has executive function (and certainly a degree of corruption) but also an obligation to it's citizens. If you spend trillions (or even just millions) of taxpayer dollars without democratic oversight, you'll probably get investigated.

There is the whole "monopoly of violence" concept but that only works because lawmaking is largely a democratic process. It's harder for the government to agree on a 50 billion dollar transaction than it is for private citizens to do the same thing. There's ample reason to fear both, and I wouldn't suggest that individual agency and concentrations of wealth "pales in comparison" to government power (unless you're discussing combined-arms warfare).