it's not just the way the world works. it's the way capitalism works. I don't think it's unfair for people to be fed up with watching these things happen while the root causes continue to be largely taken for granted.
Agree that the root cause here is not Amazon, it's a system (unregulated capitalism) that incentives this behavior. I think it's still fair to criticize actors in such a system, especially if such criticism is done with the context that these companies and their bad actions are the product of that system and that it would be positive for most of the workforce for that system to be better regulated.