You're answering a question which wasn't asked. A privatized SS system could still be mandatory (and probably should be, given the choices people make). In a privatized system, the money would actually be YOURS, and COULDN'T be taken for some pet project, no more than Fidelity can take your IRA, blow it on an epic Vegas weekend, and send you a letter saying "Tough luck, but we had a blast!!", which is what the gov't is doing now with your SS contributions. Well, except the govt's epic weekend bender is taking place in Iraq and Afghanistan, not Vegas, but still...