These are all pros, not cons, to Amazon's valuation. They are telegraphing the idea that Amazon will destroy everything that stands in its way, up to and including its own employees or even investors.

There is no kind of labor abuse or environment abuse in any sense that would not be taken as evidence of Amazon's character (and not a weakness). And again, this sociopathic behavior is what's being selected for by the market. Amazon abusing people and situations is good, according to the market.