Earlier quoted context omitted.
I think you’re conflating things. Fentanyl is a Schedule II controlled substance. So while yes, it’s “legal” - it’s an extremely controlled narcotic. Said differently, it’s illegal if you’re in position of it and it wasn’t prescribed by a medical doctor. Unlike marijuana that doesn’t need a prescription where it’s allowed.
It's not about the legitimate/medical/supervised usage, it the recreational use that kills. Marijuana (MJ) is used a lot recreationally; if people to use MJ instead of Fentanyl the OD cases would not pile up like they do today.
E.g. car accidents kill more people per year than marijuana.
Does that mean driving a car should become illegal, and marijuana legalized?
https://www.cdc.gov/injury/wisqars/LeadingCauses.html
https://www.huffpost.com/entry/marijuana-deaths-2014_n_56816...