Yes, prudently invested contributions to the Social Security fund may bring greater dividends, but those contributions would also face a greater risk. It would be like gambling. We should not gamble with the investments and the future of the citizens of this land.
Whenever you deal with science fiction you are setting up a world of rules. I think you work hard to establish the rules. And you also have to work even harder to maintain those rules, and within that find excitement and unpredictability and all that stuff.