One thing about Death Note has bothered me for a while: the idea of Kira is complete nonsense. Light thinks just by using the Death Note he can become the god of a new crime-free world. But he is just one man. He can't investigate crimes. He can't chase down criminals who got away. He isn't judge and jury to figure out who is actually guilty and who is innocent. All he can do is watch TV and find the names of criminals who have already been arrested. What use is that? If the criminal has been caught, they would be punished anyway. Premeditated crimes are done with the intention of not getting caught. Unpremeditated crimes are done in the heat of passion. Neither sort of criminals will be affected by Kira's presence in the world. He is utterly useless.