I'm sorry but with the recent Enron and other scandals, how can anyone think that allowing people to take social security funds and put them on the market benefits anyone but the brokers and the company officers? The brokers will make money, no matter what, and the company officers still seem to be trying to find loopholes so they can juggle the books and bilk more people out of more money!
Even if that doesn't happen there is absolutely no guarantee that you'll have any of that money after retirement. At least with the way things are now your pretty much assured a small but steady pay check (until it goes bankrupt).