opium is a wonderful painkiller when used properly. It is a horrible thing when abused. I cant connect how using it properly (say, you have surgery, use it for a week, and stop) is tied to abuse (buy it illegally with intent to abuse, take higher than medical use doses and get addicted).
This is the same issue with many, many things. A vehicle, used properly, gets you to and from work. Used improperly, you have this:
https://www.reuters.com/article/us-lasvegas-crash/driver-who-plowed-into-las-vegas-crowd-charged-with-murder-idUSKBN0U40X120151223
or many other car abuses -- there are so many they have their own names:
getaway car
vehicular assault
vehicular homicide
etc...
I am not sure that abuse of a useful thing makes it a bad idea: cars are not a bad idea, its just that bad people sometimes use them as a tool to commit their crimes. Short of putting everyone in a rubber room and banning all hard objects, what you gonna do?
supposedly (I do not believe the news these days) the opium crisis is the result of hundreds of idiot doctors that forgot 100% of their medical training and over-prescribed opium because the drug companies, who profit from selling drugs, told them it was OK to do that and they 'believed' it or took a kickback or something with plausible deniability defense. We have known what opium does since the 1800s, so there has to be more to this story than 'the drug company said it was ok'. And as with anything, its likely tied to money when you unravel it.
the overprescribed thing is huge. I know someone close to me with a chronic condition who has literally pounds of prescription opioids and they keep giving more (the person is wary of it and does not take them unless in unbearable pain which is rare). And, its been a challenge for my friend to find a Dr that will *treat* the problem rather than just try to dope it away. In the last year they have reduced it a little, due to awareness and law changes, but if all those pills had been used, there would be a gorilla on his back.