"You are a bad bug" reflects the notion of being flawed or problematic, suggesting that some characters in Pérez-Reverte's narrative struggle with internal conflicts or moral dilemmas. This powerful phrase underscores a theme of self-awareness and the acknowledgment of one's imperfections, which can lead to a deeper exploration of one’s character and motivations.

The line “There are days” hints at the unpredictable nature of human emotions and experiences. This acknowledgment paves the way for a more nuanced understanding of what it means to be a good person amidst challenges, aligning with the broader themes in the book "Good Men" where the intricacies of virtue and vice are examined through the lens of personal struggles and societal expectations.