If interest rates on your credit card were close to 0%, would you try to pay it off all at once, or would you just make minimum payments until the day you died? In the case of the United States, we're not going to die any time soon.
Except the minimum payment is hundreds of billions of dollars, the interest is actually not 0%, is variable and adjusts daily, is being artificially suppressed by a central bank, which is essentially acting as the last "balance transfer" option, the balance of the debt exceeds your annual income, and the consequences of default don't involve a chapter 7 filing.
So yeah, its basically a credit card. Free money.
I nominate Beams the mayor of Face Palm City.