The national government isn't a business or a household. It can't go bankrupt like a private sector entity can.

First, the Federal government literally owns the printing press. Therefore, it can print any amount of money it needs to pay off its "debts" and the interest on those "debts". I put "debts" into quotes because the "national debt" is a misnomer. It's really the "national savings" because it simply represents the amount of money the federal government has printed, less the amount it has taken back in taxes. Government spending creates money, government taxing destroys money. What is left over is what the private sector gets to use - hence our national savings.

Second, the government is not a for-profit entity. And it doesn't have to be because again, it prints the currency we all use every day. The government is designed to ensure the welfare of the citizens and the nation, not turn a profit. Any spending from the government should therefore be aimed at achieving the objective of creating safety, health and prosperity.

Finally, if the government stopped spending so it could pay down the "debt," the private sector would slowly run out of money and it would go bankrupt because it would run out of currency. This actually happened in 1832 when Andrew Jackson decided to shut down the Second Bank of the United States and paid off the national debt. The country fell into a decade long depression because the country had no longer had a central currency that was managed properly. It also happened after Bill Clinton balanced the budget in 1999 and started running a surplus. In fact, if you look at all major recessions or depressions in the United States, you'll see they were preceded by a government lowering spending in order to balance the budget. That's because the government spends the money the private sector uses into existence. Without it, the private sector goes into a recession, or even worse, a depression.