The Precautionary Principle and Chemophobia

The Great Experiment is a cute article on perfluorooctane sulfate (PFOS) and perfluorooctane acetate (PFOA), flame retardents that show up in blood samples almost everywhere. Although there is no proof that these do any harm, the author of this scary, chemophobic piece woud like us to believe that we should be worried about these. According to this article, there is no scientific evidence, even among workers who make these chemicals, that there is any recognized harm. This terrify-you piece is based on the precautionary principle which says you must prove zero harm, which is impossible so we can ban the chemicals we decide we don't like. Which is worse: the chemical that no one has proof of any harm or the deaths, disfigurement and suffer that would be caused by the removal of the flame retardants from use?