That's the thing, a lot of adult patients will volunteer to test the drugs, and that's totally different than testing them on people who can't consent. Many know that testing the drugs will maybe help someone else and are willing to take the risk.
Re: conservatives, most conservatives I know are more humane than to wish people dead regardless of whether they agree with the person's choices (or what they view as the person's choices). Being conservative doesn't mean being callous and judgemental and devaluing of people's life. Most of the conservatives I know can separate out their distaste for someone's choices (or even belief that those choices are a sin) from their wishes about whether that person lives or dies.
Regarding life expectancy, I'm not saying people with AIDS have the same life expectancy as everyone else, but saying they're "as good as dead" definitely doesn't make any sense at all. People in general are going to die. Everyone is going to die. Some people it will be decades from now, some people it will be months from now. It seems bizarre that when you know how someone is most likely going to die, they're suddenly "as good as dead" no matter when that will actually take place.
Regarding whether you associate with the "kind of people who are likely to get AIDS," I seriously hope you don't end up finding otherwise by getting it from heterosexual sex or a blood transfusion. It happens. I guess you also wouldn't want to associate with one of the kinds of people least likely to get AIDS either, if you disapprove of homosexuality then you must disapprove of lesbians (not that we can't get it, but that it's somewhat less likely).
And regarding not saying that people are "as good as dead", maybe it's not just politeness. Maybe it's people knowing that death is inevitable for everyone and that the fact that it's going to be sooner for some people doesn't mean that they're useless in the meantime. Whatever value I have to the world in the next five years will be the same whether I die after five years or after fifty, and if I knew I'd die in five years it wouldn't make me any more "as good as dead" than if I didn't know. Doesn't seem logical at all to see it that way, like people get canceled out once you know their life expectancy. And, as I said, I really hope you never have to find this out the hard way by knowing someone you respect who gets AIDS, it's not like it's a plague brought on to kill only the people you hate, it could affect someone you like too.
And, yeah, parts of this discussion are extremely distasteful. Bluntness doesn't excuse wishing people dead.