THAT IN NO WAY LETS MANUFACTURERS AND SELLERS OF PRODUCTS OFF THE HOOK !!
If you want to make money selling or providing products to consumers, and especially to children, IT IS YOUR JOB #1 TO MAKE THEM INHERENTLY SAFE.
If you cannot make it inherently safe, it is not ready to sell. Period
Stop attempting to insert some defenses you think children should have against bad advice and dangerous products -- it is utterly irrelevant.
The fact that the mom was there and turned it into a learning event was PURE DUMB LUCK. They got lucky this time. They'd better damn well fix it solidly or pull the product.
The fact that this is even a question in a modern society is mind-boggling.