Before the thread gets too far, I need to warn people against equating national debt with the analogy of consumer debt.
Consumer debt is simple. You owe (someone) money and have to pay them back. It is one way, cut and dry.
National debt is very different. It can be owned by foreign governments, or even by your own citizens, in which case the country essentially owes money to itself. This is the case in Japan, who's debt currently stands at 200% GDP, but very little which is owed to foreign governments.
US debt is held all over the place. Corporations hold it as secure investment, citizens hold it on loan from themselves at interest, etc. In some cases, countries owe
each other tremendous amounts of money, but don't square out their balance sheets because it's more profitable to ***-for-tat each other on interest rates.
Countries also forgive one another's debt all the time. It's a primary way we provide "aid" to others. And let's not forget the fact we can also just print out more dollars and hand it to our debtors, although that entails unintended consequences. Consumers can't do any of these things.
And just to complicate issues even further, owing other countries money isn't all bad. There's a great deal of political leverage you can wield when other countries have a vested interest in you surviving long enough to pay them back all their interest in 30 years. They don't want to see you go under.
Point being, it's reeeaaaally complex, and I don't think anyone other than a real economist should be trusted to lecture on it.