The Fifth Amendment is still in the Constitution.
Now, about the US government and its assets ~ not just its national accounts but its assets ~ there are assets that can be used to settle all debts.
Typical of so many Freepers you and others didn't follow Newt Gingrich ~ he had this little litany on oil shale in the intra-mountain West which is available for oil using current technology, and is owned by the US government. He placed its initial value as in the trillions of dollars.
No reason the Social Security debt cannot be redeemed with public assets.
People who want to simply write off the Social Security debt and the Social Security obligations think they've invented a new way of stealing which will not be defined that way ~ but sorry gang, theft is theft ~ there's a whole huge part of the law called "CONVERSION" and that's about every sort of theft there ever was or ever can be. So don't even think about it.
For your info the USSC has ruled that the Money collected by the SS tax is just revenue no different than any other money collect by the government. You are under the false assumption that there is a Social Security debt there is not.
The proceeds of both (the employee and the employer) taxes are to be paid into the treasury like other internal revenue generally, and are NOT earmarked in any way." Helvering v. Davis, U.S. 619, 635 (1937)]
People participating in Social Security payroll deductions do NOT acquire property rights or contractual rights through their payments, as they would if they were paying on an insurance policy or contributing to an annuity plan. Simply put, there are no guarantees! The Congress does have power to deny benefits to citizens even, though they had paid S.S. taxes. Also, the amounts of benefits granted are at the option of Congress. Flemming v. Nestor, 363 U.S. 603, 610 (1960).
The Fifth Amendment has nothing to do with social security.