Ask the union workers in Detroit about their defined benefit pension plans. Bad advice given that these plans can and do get renegotiated when the sponsor's finances make them unsustainable.
TFA says precisely that and mentions public pension plans as a more secure option. In fact, he phrases his statement to imply that he believes the "bait and switch" approach to pensions is inevitable in the private market.
> Public service is the only environment where defined benefit pensions will remain fully funded.