In J.D. Robb's book "Visions in Death," the author presents a thought-provoking quote about lunatics being rarely stupid. This suggests that individuals who commit heinous acts may possess a level of intelligence that allows them to plan and execute their actions with a certain level of cunning. It highlights the unsettling reality that intelligence doesn't preclude someone from engaging in violent or irrational behavior.

This perspective prompts readers to consider the complexities of the human mind, where madness and intelligence can coexist. It raises questions about the motivations behind such actions and challenges the notion that irrational behavior stems solely from a lack of intelligence. The quote underscores a deeper understanding of the characters and themes explored in Robb's narrative, inviting readers to reflect on the nature of evil and the intricacies of mental health.