I think you are technically correct that Truvada is a life saving drug but I feel you are being dishonest. If you exclude occupations where you could be exposed to HIV, most of the US users of Truvada could choose to change their behaviors and reduce their chance of contracting HIV to <1%.
There is also the general trend that US companies pay large amounts of money to develop drugs, charge US customers enough to cover R&D costs and then sell the drugs at cost internationally. Does that suck for us? Yes, but it helps the rest of the world significantly.