What's so special about Amazon in comparison to the Chinese factories where those goods are manufactured? Are we just upset because these people are geographically closer? Or is it nationalism; Americans/Westerners are too good for such treatment? Racism?
I used to think it was some sort of nationalism, but I think it's mostly because making sure all Americans are treated well is a much more tractable problem than worrying about the welfare of literally everyone in the world. It is conceivably possible for every American to have adequate food, housing, and medical care, to work in safe and humane conditions, and so forth. Even that seems crazy and utopian to some, but…
It is conceivably possible for every human - given the current available resources.