A criminal law that makes it preferable for carriers of HIV not to know that they are infected and capable of spreading it to others, including their loved ones, seems particularly suited to Mr. Bumble’s condemnation. Yet tragically, in a misguided attempt to thwart the spread of HIV and AIDS, lawmakers in many parts of the world have passed criminal statues that promote ignorance about the disease, punish its victims, and enhance the chances that the virus will infect new victims.