The value of labour has fallen because of a systematic dismantling of any sort of apparatus for preserving it's value. Amazon can fire 1, 10, 50, 1000 workers. They can't fire a union of every FC worker in the country. The value is only low because the field is so tilted in favour of capital.

> why must warehouse operators' pay a living wage

because if they don't then their warehouses get shutdown and anyone they try to bring in faces large men with bats.

and if you don't like that future, then start protecting unions before it turns into riots again.