The goal should be to reduce drug use and end addiction. "Harm" is relative. There are functioning heroin addicts(either tar or hillbilly heroin) that some people (https://en.wikipedia.org/wiki/Carl_Hart) would say aren't "harming" anyone. It's still not something to societally encourage.

I also said nothing of criminalization of addicts. Seller's, sure.

Methadone and clean needle clinics are pointed in the right direction, but they're not enough. They just happen to be all the people who got them put in place could manage.

This makes no sense. The halfass'd effort is worse than nothing at all.