The interest rates on US debt are artificially low because their default risk is based on the willingness, not the ability, of the USG to repay them. That's because the ability is a given, since the government can print the currency the debt is denominated in. Corporate bonds are a bad analogy because their risk is mostly in defaulting, whereas if something goes sideways in America, Treasury bonds will fail by causin…
There's a difference. The govt doesn't have this ability to print money and pay debt. The Fed does. Which means that the Fed has been keeping interest rates already artificially low by printing money. It'll take one misstep or one recession for the debt requirements to be so high that the Fed will have to make a choice between keeping rates low, causing massive inflation vs high causing massive drop in gdp and jobs.…
The Federal Reserve is part of the government. The Board of Governors is an independent government agency, with members appointed by the President. The individual banks are set up more like private corporations, but it's the Board of Governors that set the orders for new money being minted. Saying that it isn't the government that has the ability to print money and pay debt when this is the case is a little obtuse.