In the libertarian delusional utopia all drugs are legal and everyone will live happily ever after. Drugs like meth and krokodil are extremely addictive after the first use. It turns users into psychopaths who will do anything, and I mean anything, to get their next hit. So don't be surprised when you are leaving your cocaine and ecstasy fueled orgy at 2 a.m. that you are mugged and killed by a meth addict. Do you know how to create a libertarian? Take a conservative and remove all common sense.
A libertarian is a liberal who wants a tax cut
I had an acquaintance in college ("friend" is too strong a word, he was the roommate of a drinking buddy of mine) who was absolutely fearless. He tried anything, including just about every illegal substance known to man.
He once told us that "Crack" was the only drug that scared him, and that he'd never do it again. Said that he was high before he exhaled the smoke.
I've occasionally wondered if 1) He's still alive and 2) What he'd think of Meth and today's other drugs that make Crack look quaint and anachronistic.
I think that those who advocate for drug legalization equate today's drug use with a couple of joints of 60's Panama Red. Sez me, it sounds like the difference between shooting a bullet, and throwing it.
If all drugs are legal, everyone will not live happily ever after. Many people will kill themselves with drugs, perhaps even more than now. And gradually the addiction gene, if any, may diminish in the gene pool.
The one thing that will happen for sure is that drugs will be cheaper; there is no reason they should cost more than over-the-counter medications. And common sense tells me that is going to lead to less crime. You can argue that increased usage will offset this to some extent, but I am convinced that the net effect on crime can only be positive.