> It should be reasonable for me to assume buying something there is safe.
The only thing we should ever assume is that a company has policies and will honor those policies as required by law.
Here's Amazon's policy on guarantee. https://www.amazon.com/gp/help/customer/display.html?nodeId=...
There is no mention of safety.
Here's Amazon's policy on safety.
https://www.amazon.com/gp/help/customer/display.html?nodeId=...
There is no guarantee associated with it.
They are a trillion-dollar company, but what we're observing is that the market isn't hyper-thirsty for safety guarantees and is willing to accept their current climate for service convenience. Other stores will let you make a different safety-convenience tradeoff.