What business is it of yours if your neighbor is doing heroin? We could get people off the streets if we gave them treatment. A drug addicts are sick; Locking them in jail shouldn’t be the answer
If junkies receive their fix from medical authorities, along with a treatment helping them to quit, they even have a hope to become in-addicted again.
Of course, arresting or maybe outright killing a junkie would instantly remove any threat to the neighbors. It just requires stopping to see the junkie as a human in need of help and start seeing the junkie as a violent criminal or even non-human. I wonder if such an approach is sort of dangerous for the society's mental health.