Some people can benefit from the drug. But the opioid epidemic may make it difficult or impossible to obtain. That's the point.
We don't actively work to improve people who are struggling. The jail system in the US primarily keeps people down.
Then we might develop drugs which are safe to use and non-addictive, and provide real productivity gains.
Brave New World as an example.
If all drugs are developed or sold under a veil of criminality, that will never happen. We need to expose them to market forces, litigation, consumer testing and regulation.