It's not that crazy, but it has to be coupled with accessible recovery programs. The classic tale (one that people in my life have gone through) is the prescribed opiates -> street heroin when the scrip runs out / when they change the oxy recipe so that it doesn't dissolve in water anymore so you can't shoot it.

This is obviously much more dangerous than getting oxy from your doctor, so the logic of "keep people from seeking heroin on the street" actually does make sense to me from a public health perspective.