Yes, that is a huge liability, but....
In Accounting 101 we learn that you compare Liabilities with Assets. If each person is saddled with this debt, then the Assets of the United States should also be allocated to each person.
Anyone know what this country is worth? All the public land and the public buildings and the public treasures in places like the Smithsonian and the like?
Think about it and please quit looking at and talking about only one side of the balance sheet.