The correct answer to this open question is the following.
Although the question does not provide options, we can say the following.
The author chose to tell this story from the perspective of children, rather than adults because through the eyes of the children the story changes its perspective. Although what happened on the Island of Malaga was sad and difficult, the perspective of children is not as biased as the perspective of adults. Adults' versions are loaded with sadness, resentment, and pain. Their optics are so different and the story is told through bitterness. But the children's version is impartial, purer through their innocent eyes.