Light Yagami's actions in Death Note have a profound impact on the broader societal structures and institutions within the series. By using the Death Note to eliminate criminals and those he deems unworthy, Light disrupts the balance of power and justice in society. His actions lead to fear, chaos, and a sense of unease among the population as they witness the sudden deaths of criminals and public figures. Additionally, Light's pursuit of his own brand of justice creates a power struggle with law enforcement agencies, such as the police and the task force led by L, ultimately challenging the established systems of law and order. Overall, Light Yagami's actions in Death Note have far-reaching consequences that deeply affect the societal structures and institutions within the series.