Negotiating impossible pensions is not good faith, imo.
It’s “kick the can down the road” greed.
Well, then the voters can vote the guys out of office and when the contracts are up for negotiation again then try and get the unions to do what you want.
It is up the voters to demand things from the government and to put pressure on management to negotiate a better deal.
The employee live up to the contract, so should management. It applies to both private and public sectors.