As of 2012, the Heritage Foundation reported that US spending on "welfare" broke the $1,000,000,000,000.00 per year mark - all kinds of programs from free Obama phones to food stamps were included, but Social Security retirement benefits were NOT included in this calculation.
How equitable or "fair" SS is can certainly be debated, but it differs from "welfare" in that people EARNED their retirement benefits. "Welfare" benefits are NOT earned, they're simply given to people to buy their votes support their needs.
SS today has trillions in the trust fund, all "invested" in a special class of government securities which are similar to things you and I can get like treasury bills and savings bonds - but of course, the SS securities are ONLY for SS. Which would probably fuel many pages of debate and discussion here.
FWIW, a couple of decades ago Fortune magazine carried an article in which SS was compared to annuities. To make a long story short, back then a lifetime of SS withholding, invested at 3%, would have bought a 65 year old retiree a lifetime annuity paying 75% MORE each month than the maximum SS benefit.