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.
Just step back away from The Treasury and go on about your business and it will be OK.
(That's called Real Politik)
http://www.freerepublic.com/focus/f-news/2897011/posts ~ whatever you think those cases you cited say take a good look at today’s news. The meaning has changed ~