Isn't less disease better than more? I won't argue with you about sex or other things that people have hangups about, but HIV is also transmissible through blood. There are people who got HIV and developed AIDS for reasons that are innocent in any reasonable context. If you're a first responder or good Samaritan, doctor, nurse, or find yourself in some other context where it's possible for uncontrolled mingling of blood, you're at risk of contracting HIV. If particularly vulnerable people can be completely protected, then everyone's odds will improve.