Earlier quoted context omitted.
A long time horizon is supposed to be what governments are good at. No reasonable employee would trust a private insurance company to still be in business by the time they come to require, absent a governmental guarantee - and if something is both paid for by the government-as-employer and guaranteed by the government-as-regulator, what is bringing in a private company supposed to add to the mix other than taking pro…
Several private insurance companies been in business nearly as long as the US government I believe..
(Of course some companies from a pre-government-guarantee era are still in business, but "some" isn't enough when we're talking about your retirement savings)