I'm surprised they aren't looking at the "Chilian Model" as an answer, much as the GOP is trying to do on a limited scale. The successful results are right before their (and our) eyes.
No doubt the problem (there as well as here) is, it is so easy to demogogue. Plus, it takes power away from the politicians, and we certainly can't have that!
The alternative is financial collapse and societal chaos, which to socialist politicians is preferable to successful capitalist schemes. That means they get to play Savior again for at least another round.
The "Social Security Trust Fund" is simply two sets of books. It looks like an asset on paper, but since it's invested in government bonds it is an equal-and-opposite liability as well; the bonds are simply an instrucition to take the money out of the Treasury.The only way out of this box is for the SSTF money to be invested in real assets such as stocks or mortgages on privately-owned assets.
Socialism is a system for seperating responsibility from authority.
And that is both injustice and bad management.