I think you're advocating for better mental health care and rehabilitation of addicts, which I agree with. However, the idea that addicts will destroy their lives regardless of whether they stop using, or are forced to stop using, their drug of choice is an extremely dangerous statement. Many addicts get better by changing their environment and quitting/going to rehab/etc.

Furthermore, heroin != vodka in terms of how addictive it is for the average user, and that's partly why only one of them is legal for recreational use.

Controversies about decriminalization aside, harm reduction exists as a studied component in addiction, public health, and psychology circles for a reason.