> A Ponzi scheme (/ˈpɒnzi/, Italian: [ˈpontsi]) is a form of fraud that lures investors and pays profits to earlier investors with funds from more recent investors
Just replace investors with tax payers.
Many young people feel like they are going to pay into SS for 50 years to pay for the older generations and then when they retire they are going to receive less than they paid in. Obviously that may or may not be the case, but there is a general feeling that they are being gypped in order to pay for the older generation's retirement that they will not get themselves.
Look up when benefits began to be paid. The current payments very much and by design pay for the current retirees. The idea that this is some kind of elaborate “scam” when it is one of those things that every other civilized country has figured out is hilarious. Go travel. Go talk to some retirees there. Turn off the Fox News.