I had no idea about your Sweden claim so I looked it up. From [1] the only similar thing I can read is related to The Legal Prescription Program, which IMO is very different than "legalizing drugs (or just heroin)". Basically, they gave doctors the ability to give prescriptions to drugs such as morphine and amphetamine (without limitations, apparently) to addicts in the hopes that this would result in lower crime rates. This obviously lead to these drugs ending in users other than those participating in the program, which ended the program itself. Quite an obvious outcome IMO. This approach I think not only is flawed and very different than legalization of drugs (for everyone), but also let's be honest here, both society and our understanding of drugs and abuse in the 60s and now are very different. Maybe what wasn't possible then is possible now.

[1] https://en.wikipedia.org/wiki/Drug_policy_of_Sweden#The_Lega...