Asashino is quite literally what any regular pharmacist would be if they could use magic. Drugs for everyone, everywhere, everyday, whether they like it or not (or even know about it).
We have no sense of right and wrong for the most part, and are only really hindered by the threat of jail time. But since wizards apparently live forever in this series, Asashino just kinda got over that.
"I gave Marilyn Manson a pill so that he would stop talking so much"
- Johnny Depp, the pharmacist's role model