You say that they run a dating site targeting HIV+ individuals like it's a bad thing. The reality is that the majority of HIV- people in the world are woefully under-educated about HIV and the ways it does (and does not) spread. This causes many HIV- people to refuse to date HIV+ people. In turn, many HIV+ people prefer to date other HIV+ people as they know their date won't reject them due to their serostatus.
Regarding incompetence, it's not always that way. Certainly in many cases it is, but I have a friend that was in a monogamous relationship with one person. That person cheated on him, contracted HIV, and passed it along to him. Please explain how my friend got HIV through his incompetence.