why ban there is free market freewill
You should read up on MethadonE.
https://en.wikipedia.org/wiki/Methadone . It's used to treat people from Heroin, but it's even worse if you overdo it.
Methadone is available only from a certified pharmacy.No normal human being would have interest in buying it, unless they want to kill themselves.
Eh, this isn't the place for you to enforce your morals, this is a marketplace. Let people buy and sell with questionable legality. You are welcome to say whether this is legal or not, because that should be the genuine concern for the buyer's safety, however simply telling people to "not" sell their product is rather dumb if we want to encourage the use of Bitcoin as a currency.