What's good enough for GM bondholders is good enough for public employees
The cliche about “too good to be true” springs to mind.
The process is essentially a con game. The taxpayers lose and the retirees lose (those who don’t die before the system collapses).
The only winners are those who gamed the system for their power, the union leaders and the politicians they corrupt. They aren’t held responsible. (Not that they could be, since the amounts of money involved couldn’t be repossessed from them anyway.)