[stevenAthompson]

You have a fair point, but also consider the large imbalance of power here.

On one side you have a mega-corporation that can take away the employees ability to eat, live indoors, or receive required healthcare. On the other you have Joe Six-pack who could possibly mildly inconvenience his employer, at worst.

Granting the mega-corp the ability to speak it's mind, without also guaranteeing Joe a few rights in return is just moving that threat from explicit to implicit.