For individuals who follow the same pattern as the now vanished inhabitants of Rapa Nui or any other mindset that condemns rational observation, seeks for answers and responsibility for all matters in the supernatural.
The narrator did a decent job
Christianity is often questioned about how, if God is good, can we live in a universe of pain. It's a difficult problem to answer, but Lewis gives some interesting insight and thoughts on this question.
His arguments may not be correct, but do give reasonable thoughts with which to approach the problem and try to gain some understanding in the universe. It's worth considering for anyone interested in this problem of pain.