Morphine is medicine. Nobody is going to argue that it's a drug with no medical use. Opium is a lot harder to argue for, but it's still a valid argument because that history is important to the medical context of morphine. "Drugs are bad" is a really immature and shortsighted stance to take when the relationship between drugs and medicine is such a complex interplay with all kinds of overlap.
And that's ignoring the extremely important cultural context associated with using drugs OR medicine throughout the history of China, let alone other countries.
I'm not even trying to ratio you here. You're doing it to yourself.