Sometimes harm is a matter of degree and intent

Doctors selling you fentanyl so you can be sedated for surgery is a good thing.

Drug Dealers selling you fentanyl so you can get high is a bad thing

Except drug dealers do not sell you fentanyl just so you can get high because they do not care. They do not care about YOUR OWN intention. People demand, they supply. And these people can have legitimate reasons.

You ever been approached by anyone selling drugs?

Of course they care about you getting high, that's their sales pitch

I have not, but perhaps it applies to low-level drug dealers, sure, but big-time suppliers really do not care what your intent is. Many of them sell legitimate pharmaceuticals and they do not ask you what your intent is before they sell it to you, as it is none of their concern.

It is very difficult to sell anything to anyone if you don't care what they want

Even if it is as simple as "do you want to get high?" drug dealers absolutely do care what your intent is before selling to you

And they certainly care if your intent is to get them arrested and put them in jail