Money from SS comes in, it's put in your right pocket. When a certain level gets built up, SS takes the money out and "invests" it in a bond held by the left pocket. So the money goes to the left pocket, and a bond note replaces it in the right pocket. Congress then spends what's in the left pocket freely.
It's a shell game.
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It's a shell game that is being played at the moment by the Republicans. The war is being financed by that deficit spending.
Any group, Republican, Democrat or both, that is capable of this sh*t will also be incapable of managing any stock market based fund that would replace it.