In another world, there could have been NO impact at all to human beings and PFAS could be just another random chemical the body doesn't clear but doesn't actually do anything and sits there inert.
I know everyone's pissed about this but the thyroid/other connections stuff happens 10 years later as a result and these are idiot business people playing in waters they don't understand (and neither did medicine at that time). You could say, "you can't take the risk." For me these questions are maybe we need to take a deeper/closer look at what are permissible risks and at what point.
But you could use the same logic to not make any advancement ever. No antibiotics because it will cause resistence. No chemo because it will cause damage and death. People want there to be a Dr. Eggman or Hitler in this story because it's turned out to be so impactful. Like Aesbestos which solved for fire, just poorly - carpet was solving for comfort, sound deadening, and emotional well being. We just can't necessarily quantify that as easily.
It's fantastic that science continually grows in understanding and can attribute once thought "inert" chemicals to problems. "How evil children playing with matches" are though, is asking the wrong question. These people were stupid enough to say - "there's cancer in rats, lets just keep going".