I don't get that reasoning. Obviously the Fed will prevent any such loop from happening, and it won't be the least bit controversial. They have many options to

I don't get that reasoning. Obviously the Fed will prevent any such loop from happening, and it won't be the least bit controversial. They have many options to do this. For example, the Fed can in fact print money and buy treasuries (which they already did). They can (and do) pay the "profit" on Treasury bonds to the government, which they could accelerate to immediately, then buy a boatload. Or they can change reserve requirements on banks. Or ... Whatever you think is going to bankrupt the US government, it's not going to be treasuries. It's just not.