Light Yagami, the main character in the anime "Death Note," rationalizes the deaths caused by the Death Note by believing that he is creating a better society by eliminating criminals and those he deems unworthy. He justifies his actions by thinking that his vigilantism will lead to a world free of crime and corruption. However, as the series progresses, it becomes clear that his actions have serious ethical implications and negative consequences on society, leading to a moral conflict within the character.