People aren't big fans of truth in fiction. It's fiction. Why go out of your way to make it as real as possible? If there are no survivors, where does the story come from? And of course, the victors decide how the story goes. Action movies aren't built to earn the audience's attachment to the characters. Action movies are about things going boom! Save your attachment for the hordes of "innocent" people unknowingly walking to their death in a survival/horror movie.