I’ve seen many instances where a sudden outrage occurs because some ecommerce site like Amazon or some T shirt store ends up selling some product which an outrageous message on it. People will howl: how could they choose to do something so stupid? This article gives a good explanation of just how such stupidity occurs: How Amazon Ended Up With Auschwitz Christmas Ornaments for Sale | WIRED
In a nutshell, things are automated to the point that many of these platforms take on products with little if no review. The cost of review would be much much higher than the occasional cost of having to deal with these exceptions. Given that, expect more and more of this to occur until some legislation comes into play.