Private investment accounts for younger workers that will bring them a larger return on their invested funds than will be possible under the existing program.

Tell that to the people who lost their whole retirement income in the Enron debacle (and the other similar massive bankruptcies we've seen of late). I don't think they would perceive Bush's big Social Security privatization idea as a progressive one. It's just warmed over pre-FDR fleecing of the poor. It's not just non-progressive, it's retrogressive all the way back to the first half of the 1900s.