If you dig deeper, you will find that a large number of chemicals and products, started off as byproducts of primary production of one thing or another. Finding

If you dig deeper, you will find that a large number of chemicals and products, started off as byproducts of primary production of one thing or another. Finding and establishing new markets for what was waste, has proven to be rather profitable and the motivation to protect those profitable substances from scrutiny is huge, and here we are with any number of poisons and toxins maintaining legal status, many decades after they were known to be harmfull. The biggest hope for the general public, is that modern chemical knowledge and technical capacity is allowing for further processing many "feed stocks" into less harmfull, and more profitable substances. Which is why you see "sunseting" or grace periods, that protect the current profits untill the new industtry can scale up.