Crime. It's common to let it be, or leave it to the police, is it not? Has one ever considered that they are... inefficient? The notebook... the Death Note... it came into my possession so I could properly punish evildoers.
Unfortunately, those who oppose me are those who oppose the will of 神 (Kami); God. It is a sin.
Those who fear me finding their name should know that they fear because they have done something wrong. Have no fear for it, and you have done nothing wrong.
I began with the punishment of major criminals who posed a threat to the society I planned to model. But there are more threats to this New World than just murderers. Petty criminals and the lazy slackers are also at risk. Consider your sins, and be ready before God to do what is productive in this world... or prepare to leave it because I see your existence as worthless.
Beware, if you are guilty. The eyes of God see all.