Doesn't need it to justify unionizing. Unionizing is a right, and it was previously not exercised because there was no evidence of the will of the market to defraud or conspire against workers. It is now written plain for all to see that indeed, these types of arrangements are kept in board members back pockets. It is not their job to protect a companies interest in renumeration execs and shareholders. It is their job to get their share in spite of the management class's proven track records of the proclivity to engage in shenanigans and lies.

The fact you can't understand solidarity is your problem, not theirs.