HIV.

I heard on the news this morning that doctors have found the first safe HIV vaccine.
They said that out of the 2 vaccines tested, the only way they were effective was together as one.
The final vaccine does not contain the actual virus - only man-made proteins and man-made HIV "gene".
What I'm curious about are the volunteers.
Some of them ended up with HIV because the vaccines tested on them did not work.
Does that bother anybody else?
I mean that's the only way we can know...but it's so disturbing to me.
I feel like we, the rest of the non-infected population of the world, are indebted to them and their families for the rest of our lives.