Your arguments assume that the company is always wrong.The company has a naturally unbalanced inherent advantage against any employees... especially when you consider what the Taft Hartley act led to after WWII.
Reagan’s best pal at GE was famous for busting unions with anti-competitive tactics because he realized that the federal government didn’t have the teeth to enforce anything if they found out a company was treating itsworkers / unions unfairly in labor negotiations.