If every drug were illegal, then say goodbye to coffee and COCA-cola, vitamins and Free Prescription Drug schemes for selfish senior citizens. I think Prohibition should have taught us about gangsters, but the streets in my hood were washed with blood in Capone-style drivebys in the 80's and 90's. There's dozens more reasons why legalization is more civilized, personal liberty and responsibility chief among them, not to mention the Biblical arguments.
Across the board drug legalization has minuscule support here in the US. Unlike, the cavalier approach that most Europeans take towards drug use, Americans understand the destructive and immoral nature of the beast. Americans also understand how hard core drugs, ravage the minds of users over time, especially the developing intellectual and emotional capacity of our children.
If you expect drugs, like cocaine, heroin and marijuana, to be legalized here in America, you're fooling yourself. Americans continue to support intervention and incarceration, to counter illicit drug use. The government has increasingly included treatment as the third part of their drug control strategy. Treatment is a humanitarian effort, offered to any drug user desiring to break their drug habit. But if treatment doesn't work, prison is the only justified alternative left. You do the crime, you pay the time.
From your post at #3, its clear one thing that motivates your support for drug legalization. And don't try and deny the inferences you've made.