Opinion piece written by Leila Lawliet M for Month of Light Yagami on Death Note News. The rest of this post is given over to and penned by her.
And by preventing crime, I mean writing for example, "Anyone who THINKS of committing a crime will be killed by the power of this notebook, before they get to actually fulfil their intentions."
I disagree, because preventing crimes by killing anyone who intends to commit them makes deaths looks like coincidences or normal deaths. In other words, if you were to hear of the death of a certain person of which no one knows the intentions, it would've NEVER occurred to you there's someone out there "passing righteous judgement", which we all know is one of Light's ultimate goals, to make Kira famous and worshipped.
On the other hand, Light's method made people aware of Kira's existence, the existence of an entity playing the role of God, or a really powerful judge, now that the deceased are known to the public as criminals, therefore changing their mentalities and making them think twice before trying to kill/steel/rape...
Another valid argument,is the following: imagine if someone thought really hard about killing another person, even prepared for it and intended it deeply. But, this person has a final wake up from his conscience five seconds before stabbing the victim-to-be, and ends up not killing anyone.
Would Onision's method work here? Wouldn't this method have killed the future-criminal before his conscience stepped in?
But then again, that's just my wicked over-analysis and my own point-of-view to which you are free to reply.