The US debt is just the amount of savings in US dollars that the non-government sector has accumulated from government spending that hasn't yet been paid back in taxes.
In other words it is a component of the money supply that allows people to save safely for the future.
The problem is the idea that this saving has to be rewarded in some way. It doesn't. The saving will happen anyway for status and insurance purposes and then have to be accommodated by additional spending.
It's the belief amongst economists like Powell that they are 'guided by the stars' that is the issue. We should not be using interest rates as a control knob. After 15 years it should be clear they don't work as advertised.
The stabilisation policy for an economy needs to be in the market for labour, not the market for money.