"Before too long Social Security was funding all sorts of things for which it was never intended (e.g., disability, dependent children). Congress viewed it as a giant vote buying machine. Further, they saw that great big pile of money from Social Security payroll taxes and couldn't help but spend it and replace it with worthless IOUs. Perhaps more worrisome, within 30 years of being enacted the average life expectancy had increased to about 70. As a result, at over time there were more and more living eligible recipients and fewer workers per recipient."