Most of the "drug" problem isn't caused by drug use, it's caused by the law book. Prohibition creates problems. You ought not ignore that.
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All that you say is true.
The Swiss did an experiment years ago. They proclaimed that a certain LARGE field was a place that "anything goes."
They tried it out for a year.
It was a catastrophe of drugs, alcohol, sex and filth.
The Swiss doctors saw conditions of health and filth that hadn't even been WRITTEN about since the 14th century. The mixtures of all that was a disaster for young people.
They shut down the field. All is well in Switzerland now, replete with their former laws.
The fifth commandment, "Thou shalt not kill," also applies to behavior that is suicidal, such as drugs, alcoholism, over eating, never moving and such.
It also means trying to protect young people, who sometimes are hormone-driven, from themselves.
It also means trying to protect young people from STUPID.
Laws WERE made for a purpose and they were MEANT to protect people. If that means being a "wet blanket" for the stupids, then so be it.
Democracies require educated populations to function; ignorant populations cannot govern themselves from the ballot box.
Can't the same be said for drug-basotted populations?
Most of the drug problem is caused by the welfare state, which is the great enabler. Prior to the welfare state, alcohol and drug abuse was self-limiting because addicts who exhausted the support capacity, or the tolerance, of their families were reduced to squalor and died pretty quickly. It was ugly, but effective. Today we feed, house and medicate them, and they live, breed, and vote democrat.