Ann you need to check your math on the amount of real dollars paid by people who paid the max OASI tax. Nearly all their benefit would be taxable based on the premise that once you get back what you paid into the system, the rest would be taxable. take a look at
My father's portion of OASI was just over $20,000 and his got back what he paid in, in less than three years. He got back his employers in another 2.5 years. That means even though he paid more than most, he still got back alot more than his payments would have in US Treasury notes.
Which lists the theoretical OASI rate for years 1953 to 1999. Rather interesting. It explains why we have a problem. Maybe the experts should study this a bit.