The stories of Robert Moses and Lyndon Johnson highlight the complexity of human motivations and actions. Robert Moses is portrayed as a complex figure with both noble and terrible motivations, while the Lyndon Johnson books delve into the idea that a bad person can sometimes do a good thing, posing the question of whether the end justifies the means. The Power Broker presents a contrasting perspective where a person can do both bad and good things, and the outcome of actions can be unpredictable. These narratives underscore the inherent uncertainty and ambiguity of human nature and decision-making.