So you'd just leave your dying friend to the enemy if going to rescue him meant exposing yourself to hostile fire? I don't get it. How is that any different from exposing yourself to a bloodborne disease that possibly could kill you? Should firemen not go into burning buildings to rescue people because they might get killed?
I would never leave a wounded soldier behind. But if I am going to die, I want it to be from a bullet and not a disease passed to me by a fag.