Social security is an annuity...not a ponzi scheme...
If you receive it, I will never be able to convince you that it's bad.
But it requires at least as much revenue as it dispenses in order not to collapse, plus administrative costs. And that assumes it's run properly and not simply plundered at will to fund useless nonsense, which tax revenue invariably is.
Not to mention the moral hazard of enabling profligate living, in the knowledge that someone else's money will be made available. Or that greater tax burdens disincentivise workers. Or the usual socialist assumption that we're all in it together and the department of central planning should be in charge.
In summation, FDR was a putz and his New Deal agenda was yet another which just so happened to massively increase government size and power, and decrease individual choice and personal responsibility., which is how we have arrived at our current predicament.