The article explains another way to see it - because the manufacturer in this case (and most safety cases involving Amazon) are sketchy Chinese companies that are selling products that don't even attempt to meet any sort of safety standards, contain counterfeit safety markings, and are basically illegal to sell in the United States. Both the seller and manufacturer are impossible to track down when something goes wrong. I would bet even if you were able to track them down it would be impossible to enforce any fines or judgements against them because they are in an outside jurisdiction.

It can be argued that Amazon should have some sort legal responsibility to do a miminal vetting process for things it sells on it's site. Or, in other words, should be required to make an effort to only sell legal products.

"Not our problem that someone else is using our store to sell illegal and unsafe products that we store in our wearhouses, accept payment for, and deliver" shouldn't be a valid defense.