Probably when American consumers will be willing to pay 10% extra for every purchase.
I suppose I understand why the very rich and business interests make arguments like this, but usually it's just ordinary people. Who benefits? It's about time we held companies like Amazon accountable for the way they harm and exploit their employees instead of helping shift the blame to their customers.
So there you have it! Create your own "Amazon," 10% more expensive but we treat our employees better.
Also, for fuck's sake stop making excuses for abusive employers. Why would you do that?