What evidence in the text supports this theme in chapter 10 mariposas

In walt whitman's attitude toward death in "song of myself" differ from dickinson's attitude in "712: because i could not stop for death"?

What is the difference between a major and a minor character? a major character has a less important story line, while a minor character plays a bigger role in the plot. a major character plays a big role in the plot, while a minor character has a less important story line. a major character has an unimportant story line in the plot. a minor character's story line is as important and developed as the major characters' story lines.

Who is ¨ the guilty party¨ at the end of the text, and how do his actions contribute to the storys theme?