Why do we find such stories moving?
Let me suggest a reason. For all the claims that “everything happens for a reason,” we recognize that some things do not happen according to reason. True tragedy exists in the world, when those who do not deserve it, yet receive suffering.
Our humanity (here, a normative term), demands something else. It demands something like justice. It demands fulfillment, even of those lives that are not capable of fulfillment. This is why we act as much as possible to make lives fulfilling, even for those who cannot be fulfilled by a full life.
The truth of this need, the need for our neighbor to be fulfilled, is a central claim within the Christian narrative. This is a part of my own culture, and a part I cannot reject. It is a basic matter of faith to me. It is the best “argument” for (or perhaps better, “experience of”) Christianity that I know.