When national (and other) pension systems were built on the basis of relying on active workers to essentially be the ones actually paying the money in to pay the pensions of the retired workers, the handwriting was on the wall, collapse was inevitable even if not imminent. Even U.S. social security was made to function that way as any “excess” incoming contributions were not truly invested, just “loaned” from one side of government ledgers (SS) to another side (general fund) to eventually be redeemed in the future by contributions from future SS contributors and taxpayers.
Why is the fed and every other country been manipulating interest rates so low for so long - to keep payments on government debt down as the amount of debt mushroomed, with pension and promised medical benefits the largest growing part of it.
Nazism was national socialism; Communism international socialism. What’s happening is not just in the US, its Europe, Africa, South America.