Diction tells a lot and highly contributes to the meaning and tone of a poem because its your word choice. The different words you use can completely change your poem.
Answer:
The central idea of the text is HUMAN NATURE
Explanation:
Though it may seem to be Trick or Treating, the point of the sentence is to understand how it is a affecting Human Nature. I'm assuming the rest of the passage is based off the human nature aspects as described.
The central idea is defined as "The main point the author is trying to get across to the reader."