Because that would be more work than I want to do, or maybe more work than I have energy for. I’m not defending Amazon but there are more concerning things in my life than always fighting the good fight for or with other people. This is just one of those areas I chose to make a small moral sacrifice to relieve a substantial physical burden.
Being shitty to each other is a big driving factor in a lot of human innovation. We are typing angry words instead of throwing rocks, most of the time, so at least there is that.