Game-Changing HIV Shot Can’t Get to High-Risk Groups Fast Enough | Lenacapavir proved it's possible to prevent 100% of infections in women. Access and affordability are the next big hurdles.
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.
Historically, the answer on this has involved charging very different amounts in different countries. This both enables some level of access by the poor and maximizes profits.