Fair enough. I never expected anything back from social security, though, because I have always regarded it as a tax/ripoff.
Most Americans have gone along with the "ideal" of government programs taking care of people with what you call "the spirit of Social Security", and I will accept your position on the basis that if/since this government rightly "belongs" to the people and that the "people" if they so choose, might organize programs like this, for a whole lot of good reasons or even noble aspirations for social justice.
I just see where we've been betrayed in our trust and expectations, and how it looks like it's only going more and more off from what we would justly expect.
And, no, I have not thought it a good idea to "invest" in our so-called "markets" since various "insiders" seem to always be working them. A better way to "invest" social security funds would be to do some very good infrastructure projects with carefully analyzed payoffs in improving our productivity/competitive economic position. On my list of appropriate projects to be paid for out of social security funds, with the government issuing bonds in the name of the social security administration, to be paid back with either taxes or receipts from the projects. . . . nuclear power plants, highways, water projects, and other things that would result in widespread benefits to all over the years. The reason I say "nuclear" power projects specifically is that such projects can be done with updated technology and multiple safety factors and still have a very good return on the investment. Solar, wind, water, no so much. But anyway, whatever people can see as the best type of project, that's what to do.
You get jobs in construction, more downstream jobs in new businesses finding a competitive market niche because of the available transportation, power, or other resources. . . . the economy grows, and even lower tax rates overall downstream. And the "social security funds" earn great interest and still belong to the workers they came from.
The folks who would still be taken care of with honest tax allocations would be enjoying a society that does honestly care for those who honestly need the care. I think that's the true "spirit" you ascribe to and incorporate in the social security plan.