The quote "I thought it was 'innocent until proven guilty'" reflects a disillusionment with the legal system and societal norms. It suggests that the principle of presumed innocence, a cornerstone of justice, may not hold true in reality, exposing how perceptions can be misleading. This sentiment conveys a deeper commentary on the flaws and biases inherent in legal processes.

In J.D. Robb's book "Immortal in Death," this idea is explored through the narrative and characters that confront the complexities of morality and justice. It highlights how assumptions about innocence can be challenged by circumstances, revealing the darker truths of human experience and the judicial system's shortcomings.