What makes you think that store treats its employees better than Amazon treats its drivers? Maybe you can talk to the employees, but that's just the first layer. What about their suppliers?
As dehrmann said in a parallel comment, sure I can pick up almost everything at local stores, but I don't believe that most of them treat their employees any better than Amazon does. That's why I listed farmers markets and our fabulous Powell's as alternatives where I'm pretty confident that employees get treated well or there aren't any.