@Zen I have no doubt (since you tell us so) that you are so easily aroused to fits of blind, murderous rage that you would gladly kill another human being—and maybe even torture him a little by drawing his death out by infecting him, presumably, with a more virulent strain of HIV. But, this hardly qualifies you as a civilized person, even if you do share this barbarous trait with many of your fellow countrymen.
Consider first the futility of killing people who kill people to show that killing people is wrong. Doing so only serves to lower yourself to the same moral level as the offender. Moreover, it makes you (and the state) an accomplice to his crime, when it is a crime. This is why 114 countries (out of 140) have stopped practicing capital punishment, leaving us in the company of some of the most backward societies on earth.
Second, it is highly counter productive in this instance, insofar as killing people who “knowingly” infect others removes all incentive to get tested for HIV. So, in this respect, getting on your vengeful moral high horse, while no doubt pleasurably self-indulgent, will almost certainly guarantee that the very people most at risk of infecting others won’t get tested so they can’t be accused of “knowingly” transmitting HIV.
By the way, getting high risk persons to get tested is still a terrible problem in the major HIV risk groups, and the very expression of attitudes like yours only serves to remind those who are at high risk of the downside of getting tested. Congratulations, you have just set back AIDS-awareness and prevention efforts among everyone who hears your message, thereby increasing the likelihood of the very risk you hope to prevent.
Third, even if someone knows that they have HIV, it does not follow that they are principally at fault in infecting others. In certain cities, the seroprevalence rate among gay men is so high that it is reasonable to assume that the other person is infected also. If the other person consents to unprotected sex it is either because 1) the act being engaged in is very low risk (like oral sex), or 2) it is assumed that the other party is infected also. It is everyone’s responsibility to look out for their own serostatus. If your little darling comes down with HIV it is not because some awful bad man infected him; it is because your little darling likes to take it raw, up the ass, from people he does not know very well.
Fourth, HIV infection is not the death sentence it once was. Not only have the most virulent strains died out, but treatments have improved life expectancy. This alone should undercut any knee-jerk resort to the death penalty.
Fifth, capital punishment moves us back to the barbarous principle of punishment for punishment’s sake. If there is to be punishment, it should be constructive in some way. It should either correct the offender, deter certain behavior, or otherwise heal the society from this breach of common regard. It should not be so that the victim or the victim’s family can take sadistic pleasure in watching the offender suffer. That is truly barbaric.