D.T.,please don't take my comment for anything other than it is, mate. It's just a comment.
My point of view as a person who believes 100% that the Scriptures are God inspired is going to be at minimum somewhat different to others on many things, and radically different on other things. I only mean to offer my opinion, that it's different is by no means a controversy, as I don't care if what others think is different from me, and it has no bearing on my opinion of them as a person, or whether I will consider them a friend or not (for the most part).
As for the science aspect, I have no problem with science, so long as it's honest with itself. Darwin's theory of evolution has long ago failed by it's own authors parameters, yet the scientific community fails to recognize it.
As for the original subject of self sacrifice, I believe that it's a little demeaning to reduce it to survival of the fittest. Take Perfesser's story, for instance. I believe that he was acting out of love for a fellow human being, whether or not that human being was familiar or not to him was not relevant as he was doing what a person designed in the image of God must do, and that is love. "Greater love has no one than this, that he lay down his life for his friends"_ JC and similarly "Love your neighbor as yourself"_JC