Why does media focus on these extraordinarily rare stories?
There are a few rare people who knowingly transmit HIV, and the media focuses on these exceptional cases - and laws and policies are made around these cases.
We need to remember it's everyone's responsibility to negotiate safe sex (I disagree with nondisclosure laws). Did these people ask if he happened to be HIV+? Did he lie? Why aren't we being given this information?
You can't just assume people's HIV status. Assess the risks, then make your choices.