Some people think that "society as we know it" (which is to say, back in the 50's when it was great to be a middle-aged white guy) started to fall apart when Rock and Roll was introduced. Some go back to FDR's New Deal. Some point to welfare and LBJ's Great Society.
Me? I think it started when Monopoly introduced a card that allowed the bearer to keep the $200 from "Bank Error in your Favor" and not require you to do the right thing by going to the bank to report it.