You apparently didn't read the original letter to the editor, from Marlene Pearson..she used it.   I gave you the quote....Any search of SS and FDR should give you the give & take between cabinet members & FDR, and his statements that he knew it could not stand on it's own.  When a program is a failure....and you know it ahead of time (like welfare, ss, osamacare, etc.) it's criminal.  No? Did you not read the quote above?  What does "accumulated DEFICIT" mean to you?  If a program cannot "sustain" itself without "deficit"....I'm pretty sure that's the ultimate definition of "unsustainable".