Acharya Prashant explains that the concepts of positive and negative thoughts are entirely products of human conditioning. He argues that what one person considers positive, another may see as negative, depending on their upbringing and social environment. He emphasizes that fear is the root cause of both positive and negative labels, as people use these categories to create mental walls and patterns. He asserts that fear is inherent in any rigid pattern or routine, and true understanding is the only remedy for fear. He clarifies that terrorists are not fearless but are driven by deep-seated fear, as only a frightened person can resort to violence.