I also don't buy this naive "But we didn't know!" excuse he gave. Maybe you and I didn't know but the people who developed these harmful chemicals sure as hell knew. Exxon, for example, knew exactly what was going to happen going all the way back to the 70s. And as far as other chemicals are concerned, companies like 3M and DuPont knew about how awful PFOA were because it made their own employees sick and better solutions were available in the 60s and yet they (literally) chose to bury the evidence and it was only uncovered during a lawsuit. Monsanto, another one of those evil companies, knew exactly how dangerous its pesticides were and yet their chief scientist in a black and white ad said it was safe enough to drink. Thank goodness for lawsuits to deal with their kind. Dow tried to manipulate laws to allow spraying of more toxic chlorpyrifos in California about a decade ago. Their kind does indeed deserve to go extinct.