Light Yagami's need for control over life and death is primarily driven by his strong sense of justice and desire to create a utopian society free from crime and corruption. He believes that by eliminating criminals through the power of the Death Note, he can create a world where people can live without fear and where he can be the ultimate arbiter of justice. This quest for control is also fueled by his ego and desire for power, leading him down a dangerous path of moral ambiguity and ethical dilemmas.
