No one is advocating for no regulation at all, but there is evidence on how limited regulation and not putting people behind bars for consuming even hard drugs like heroin is actually benefitial and results in fewer deaths, look up what happened in Sweden.
Clarification- I didn’t think they were referencing illegal drugs, rather I believed they were talking about regulations to bring medical drugs into the market. Eg cancer drugs etc, which have to go through rigorous trials and validation first.