> none of the people involved would have any complaint afterwards.

Rating the buyer's satisfaction depends a heck of a lot on your timescale. For many drugs and many users, sure, it's a net positive out to infinity.

But in the midst of an opioid crisis, we need to acknowledge that many people are having their brains broken in a way that their short term preferences (yes, more fentanyl please!) are completely out of sync with their long-term ones (shit, I wish I hadn't destroyed my life).

Treating the drug market like some idealized commodity exchange seems naive and harmful.