Actually considering the positions of both people is... inconsistent with a rights-based view of morality.
No. The point is that people's rights are a key part of their position, and it's impossible to evaluate people's interests or "expected value" without considering their rights. That's not to say that you can never override people's rights, but it needs to take a lot, particularly if the violation is very serious (eg mass imprisonment of people who've committed no crime). Moreover, if you need my consent for your plan, that's a great way of making sure that you really are acting in my interests. There is no end to my suspicion of people who view breaching rights without consent as a minor hiccup in their plan, rather than a key reason to abandon it.
Trying half measures and then doubling down
This is just rhetoric. An agile approach based on feedback and iteration is an equally good description. The failure of the "half-measure" should make you doubt the project a bit. It looks very much like you've got a hammer and are determined to wield it.
I don't see why you're not excited by the ability to adjust the risk of activities.
Hang on now. I think the pharmaceutical companies who came up with the various tests and anti-retrovirals etc did something worthwhile. I think the people who campaigned for condom use did something worthwhile. But I'm not excited about compulsory testing and mass imprisonment of the innocent. Once again, the question is: who should pay the costs of this risk adjustment? It looks to me very much like you want society as a whole (and HIV sufferers in particular) to subsidise your favourite recreational activity. You should pay.
If I expected a prohibition on alcohol to have positive expected value, I would support one.
Of course you would. And you'd place practically no weight on people's freedom to drink (or sell) what they want, and you'd place practically no weight on people's enjoyment of alcohol, but massive weight on the health drawbacks and drunk driving statistics and the occasional alcoholic. And then you'd add in the subconscious bias that you don't drink, so screw those guys (just as I do not believe for one second that you'd be in favour of a quarantine if it applied to you). Which is why people like you were gung-ho for prohibition, and shocked when it didn't work (they too didn't want to bother with voluntary attempts or partial measures). And why you are no doubt gung-ho for gun control. And why you will no doubt be gung-ho against every civil liberty in turn.
I consider this brand of politics far more dangerous than the HIV virus, but you'll note that I'm not calling for your quarantine.
[edit]Huge portions of this comment were missing originally; it's been edited but the context for descendent comments may have changed.
eg mass imprisonment of people who've committed no crime
I will point out that the current legal practice is to basically consider 'being suspected of having an infectious pandemic disease' as a 'crime,' in that the CDC can detain people at its discretion. If you subscribe to the 'non-agression principle,' I think this is consistent with that, since carrying an infectious disease is threatening or initiating violence (ev...
A post from Gregory Cochran's and Henry Harpending's excellent blog West Hunter.
The commenter Ron Pavellas adds:
The Wasserman Test.