If the other commenter saying "The problem is 3M scientists have know toxicity to human and have withheld the information to the public and regulators" is accurate, your point is invalid. How could we ban a product that we were misled on.
I totally agree if the toxicity is known. But the fact that these chemicals aren't banned completely, must mean that this isn't yet widely excepted?
Toxicity is a wide spectrum so the truth could be somewhere in between. Maybe teflon coated products don't have enough to be toxic, but dumping the chemicals wholesale into the water supply is enough to be toxic. And 3M could have concealed this high-dosage toxicity from regulators. (I'm trying to reconcile "3M scientists have know toxicity to humans" and the fact that these chemicals aren't banned)