"So, National Debt should compare to GDP the same way people can not handle their mortgage payments?"

Blah blah blah.

People can't handle their morgage payment because their debt is more than 10 times their income, and over a 30 year period, they wouldn't be able to pay it off.

But seeing as how the national debt is 9.4 trillion, it is not even comparable in terms to the above.

You are wrong, and you don't have a clue. I feel sorry for anyone who ever worked with you, because you are patently an idiot.