In "Zom-B Underground," author Darren Shan emphasizes the presence of cruel individuals in society and the need for accountability. He suggests that while it's crucial to confront and hold others responsible for their negative actions, one must also look inward. Recognizing one's own capacity for meanness is essential in this process.

Shan's message encourages self-reflection alongside vigilance towards others. By urging readers to be the most accountable for their own behaviors, he fosters a culture of personal responsibility, highlighting that we must not only address the flaws in others but also strive for self-improvement and integrity.