Because a deal is a deal.
“Because a deal is a deal.”
Between the parties. This is the nub of the problem. UAW will not give in. GM cannot survive if UAW insists on “a deal is a deal.” It cannot even make it out of bankruptcy. I don’t know where you have been but that is the whole problem in a nutshell. Unless “a deal” is not “a deal” GM is toast. There is not enough money on the planet to save GM unless the UAW breaks the deal.
Your concept of a deal is a deal is why the shorts are making a killing in GM.