I don't know how this whole buyback thing works really, but could they not just do a "sellback" of some of the shares they still own if they now need the cash? (Of course they might have to do so at a bit of a loss.)
They are incentivised to protect the interests of their shareholders.
Unions are set up to (N/A in USA) protect the workers.
It is generally assumed that decision makers will care more about their own wealth than other people’s wealth.