I can speculate on some possible reasons for portraying Berlin in a way that could be perceived as having psychopathic traits in the first season.
1. Creating Tension and Conflict: Introducing a character with psychopathic tendencies can add an element of tension and conflict to the storyline. Berlin's unpredictable and manipulative behavior might create challenges and obstacles for the other characters, making the plot more engaging for viewers.
2. Establishing a Strong Antagonist: A well-developed antagonist can enhance the drama and suspense in a story. Berlin's psychopathic traits might position him as a formidable adversary for the group of robbers, adding complexity to their relationships and the heist itself.
3. Providing Depth to the Character: Characters with psychopathic traits often have multifaceted personalities. Showing Berlin's psychopathic side could be a way to delve into his background, motivations, and psychological makeup, making him a more compelling and intriguing character.
4. Exploration of Moral Ambiguity: Berlin's psychopathic traits may be used to explore themes of moral ambiguity and the complexity of human behavior. The show might use him as an example of how people can exhibit both dark and redeeming qualities.
5. Highlighting the Heist's Risks: The portrayal of Berlin as a psychopath might underscore the inherent dangers of the heist. It could emphasize the potential consequences of being involved in illegal and high-stakes activities.
It's important to note that while Berlin's character might display some psychopathic traits, he is still a fictional character, and television shows often take creative liberties to enhance storytelling and engage their audience. Also, it's essential to recognize that psychopathy is a complex mental health condition and should not be trivialized or stigmatized based on fictional portrayals in media.