Currently the only criticism you've made of the comparison is the name and amount of social acceptance. > A Ponzi scheme is a fraudulent investment operation w

Currently the only criticism you've made of the comparison is the name and amount of social acceptance. > A Ponzi scheme is a fraudulent investment operation where the operator generates returns for older investors through revenue paid by new investors It's not a 100% perfect match, but there are certainly enough similarities between how Social Security systems work and the basics of a Ponzi scheme that you'll have to make an actual criticism of the comparison if you want to argue how they're not the same.