You say if we ban one substance, they'll just come out with a less tested, less understood, and likely worse new one. I probably agree with this!
Then you say we have to just take it away, like a kid who is being irresponsible with a ball. I understand this means you think we should ban the materials.
--
If we ban these substances, won't research just pour all the more heavily into the new ones, causing the 1st scenario you mentioned? Are you suggesting we ban research into _any_ new materials whatsoever?