Regarding your first paragraph: I was operating based on a very loose hypothetical question that you posed. So, I think you’re unintentionally strawmanning me here a little bit…
As far as the second paragraph is concerned I see your point. However, I specifically said life had to consume other organic material to survive, but not necessarily kill in the process. At some level of the food chain it does ultimately become a necessity though, and I do not see that as an ethical dilemma per se.
Conventional brick and mortar retail is extremely expensive to maintain. It has less to do with Amazon specifically, and more to do with the rise of online retail & direct to consumer business models more generally. Don’t get me wrong, Amazon was a huge pioneer in that area, but it would have happened one way or another.