You also seem to misunderstand the argument here. If you had read the article, you would know that even when taken out of physical stores the CPSC continued to push for a banning of the Buckyballs. So clearly this legislation isn't about eliminating it from toy stores, as that already happened and wasn't sufficient for the CPSC.
I'm very much not trying to be disingenuous, I realize children were harmed. However, if that is the simple criteria we are using to determine businesses to legislate away then the selective enforcement is even more worrying.
It's plausible that they might become overzealous, sloppy, subject to some unforeseen corruption, etc. Your previous assertion that they might begin censoring speech strikes me as rather over the top.