I think this is somewhat addressed to me and I don't want to miss responding to something to which I'm supposed to respond, so here goes:
"You can get around the whole question of social costs of drug use somewhat by denying people emergency medical care unless they can pay for it. To me, such a policy would be inhumane and unconscionable.You'd have people dying outside the emergency room doors and medical facilities would demand payment before they treat somebody with a gunshot wound, for example. I think you're going to have a very difficult time with such a policy."
The idea wasn't deny them care -- they get the care and then deal with the bills later. I'm with you, outright denying ER care would be absurd. But I do think that if people are going to get themselves hospitalized because of idiotic personal decisions with drugs that they should pay the cost of their subsequent medical care. The concept behind legalization is essentially "It's my right to do what I want as long as I'm not harming others," and with that comes paying the price for personal habits like drug use (lest others be expected to foot your bills -- which would certainly be harming others and subsequently not part of this credo.)
"Furthermore, you're not going to completely get around the question of cost. Making drugs cheaper and legal and then denying people medical care and eliminating investment in social services will simply create more homelessness, more domestic abuse, more anti-social behavior, more poverty, more crime."
Tangent -- what exactly are we talking about with antisocial behavior? If we're talking about the literal personality disorder, I promise you a libertarian government is going to fight that because a libertarian government's main priority is to defend the rights of its people from others. If it's something less literal I'm not sure what exactly we're talking about and would appreciate clarification.
Now, to the main point. First, as noted before, medical care isn't being denied. As for elimination of investment into social services, you can either keep the investment into social services with the current War on Drugs budget and eliminate enforcement/incarceration costs, which would be a huge savings in and of itself without losing the social services, or you could take the money that was going to enforcement/incarceration costs and invest it into these social services, keeping the same cost issue but turning it into a more effective investment into the community. We don't necessarily have to whack everything about the budget for the WoD to save money/improve conditions/both (and I'd argue whacking everything very well may not improve conditions).
"As for AIDs, the tremendous decline in the transmission of AIDs by drug use points again to the smashing success of drug laws. Legalize drugs and then see what happens to those numbers. Look at past numbers of AIDs transmission by intravenous drug use. Also, you neglect to look at cases of AIDs transmission by sexual contact in which the partner got AIDS from drug use."
I didn't neglect it, I asked for clarification because I wasn't sure if that's what you were referencing in and of itself. There's no question that drug use can lead to dire negative consequences like AIDS. If you're not careful with use of needles then yeah, you're practically setting yourself up for calamity. That said, once the person has AIDS, the situation from the standpoint of "does this hurt someone else" is no different than it is now. Someone who contracts AIDS from their own drug use and neglect is still going to have to be as careful around others as someone who contracts it any other way. The only change is that the people who themselves contracted AIDS from their own drug use are obviously in a pretty bad spot they otherwise wouldn't be in -- but just like people who would get hospitalized for legal drug use, it was entirely within their control not to contract AIDS. They took the risk and they pay the price. As for "AIDs transmission by sexual contact in which the partner got AIDS from drug use," wouldn't that be the fault of the sexual contact instead of the drug use? And if it is, I'm fairly certain it's illegal to have sex with someone when you have an STD without notifying them. I recall an NFL athlete (can't remember name) getting in trouble for this not too long ago. And I wouldn't make that legal, so it's the same consequences as it is now.