How does the narrator in top of the food chain advance the story's theme of thoughtless decisions leading to unintended consequences

I believe that it was his unreliability that helped advance the story's theme of thoughtless decisions leading to unintended consequences. The fact that we cannot really believe what the narrator is telling us helped the story proceed its natural course of telling. 

This place and its striking diversity deserve recognition for doing exactly what nature does best: providing wonder to all

.Explanation: Got it right on my test.