You are in your mid-twenties and you have it all figured out.
You think that 200,000,000 workers all making individual investment decisions would result in a return on investment and retirement system better than social security. You think the logic of return above real growth + inflation can last forever (it cannot - eventually only some people would have all of the money - do the arithmetic).
You like the crap shoot that the market provides and are OK with a large chunk of those 200,000,000 investors getting screwed every 20 or 30 years?
Social Security is one of the best most stable investment programs ever invented and young Libertarians such as yourself have been complaining about it since I was your age.
My 92 year old mom worked her entire life and saved and the marked F***ked her. Her social security is the one safety net she has. Her social security makes it less on hard on me to provide for her, which I do, btw.
I'll be curious to see what your opinions are when you are 55. I heard your exact same arguments from the Silicon Valley crowed 30 years ago. I was at Berkeley, they were at Stanford. That's funny, public vs private. Social Security was supposed to be broke by now. It isn't. And the only reason it will be is if the illogic of the Libertarian Fundamentalists such as yourself remain in control and the Goldman Sachs and other (overpaid) investment bankers of the world and the U.S. Oligarchy continues to transfer wealth to itself at so ably has done these past 30 years.
Read Les Leopold's book The Looting of America, How Wall Street's Game of Fantasy Finance Destroyed Our Jobs, Pensions, and Prosperity and What We Can Do About It.