I am speechless. I can somehow forgive the 60ies and 70ies, when awareness of the long term effects of certain substances and technologies just started to build

I am speechless. I can somehow forgive the 60ies and 70ies, when awareness of the long term effects of certain substances and technologies just started to build up. It took us long enough to deal with the damages done in those times, there are still buildings which have to be decontaminated from asbestos and other harmfull stuff. The ozone layer also is just barely recovering thanks to the ban of the responsible chemicals. I also can understand, that banning a substance takes a while for establishing good alternatives. But once a harmful substance is finally removed from the production chain, why would one want to bring it back, knowing exactly what this is?