Light Yagami's actions in Death Note have a significant impact on the broader societal structures and institutions within the series. By using the Death Note to eliminate criminals and those he deems as threats to society, Light initially gains support and admiration from the public who see him as a hero bringing justice. However, as his actions become more extreme and he takes on the role of a self-proclaimed god of the new world, societal structures begin to shift. Law enforcement agencies and governments are challenged as they try to stop him, leading to a breakdown in trust and an increase in surveillance and control measures. The moral and ethical implications of Light's actions also spark debates and divisions within society, highlighting the complexities of justice, power, and the consequences of playing god.