Tom, all the more reason to make more as you can.
I have not read the book, so am only qualified to discuss your response. Basically, the term 'bankruptcy' means very little when talking about a nation... who's going to 'collect'? Will the US government default on the bonds, the loans, the T-bills? No.
When push comes to shove, a government can print money, and it can inflate our way out of debt. The analogy is like buying real estate 30 years ago. What % of your current income will the payments to service that mortgage mean to you today vs what % it meant to you then? Your payment gets cheaper and cheaper doesn't it?
The dollars the government pays your bonds, T-bills, loans back with are not worth as much as the dollars they borrowed, and they can accelerate this at their whim, since they control interest rates.
Knowing this, we don't need to prepare for the worst by building bomb shelters and buying small farms in Iowa, but we do need to try to ensure that the dollars we have can beat that inflation and doesn't depreciate.
Can that happen buying 5% T-bills? No, because that's how the government will get out of or reduce national debt... by ensuring that the debt is worth less at payoff than it is today. That's the measuring stick wouldn't you think?
So... where can we put our dollars today that can beat government controlled interest rates? If we all think the same thing, the stock market is going up.
More interesting... propping up our lousy economy and overwhelming debt is of great importance to other nations.
If you foreclose on a house worth only 1/2 of your loan, you are going to lose a lot of money... helping the guy a bit so he can pay you fully later is a better idea under those conditions.
Soo... what keeps US consumers spending? A happy stock market and no immediate worry about their retirement or pension funds (vested in Mutual Funds... in the stock market)?
Where do these foreign nations keep all that money we give them anyway? In US dollars... I don't think they want the dollar to become worth less either.
It's a pretty delicate balance, but it behooves everyone to maintain it. So if your book is all about doom and gloom because we're in debt, I think it's wrong.
How will it all end? I may not be a nobel laureate anything, but I think we will inflate our way out of debt if we have to, it's just a very painful pill to swallow at once.
Propping up the stock market is the logical tactic, as we inflate our way out of debt, because people keep spending (keeping up GDP), we won't panic about our future (keeping us spending), and if we can try to drop the value of the dollar vs other currencies, we can rebuild our industrial base again, keeping employment higher and us happier with our politicians. And lo! We have a stock market crash protection team now... hmm.
These are my thoughts only of course, but it seems to me that some people focus too tightly on the trees, and just don't see the whole forest. Just what can happen to an entire nation that goes 'bankrupt'? Not a thing. We all wake up the next day anyway.