I noticed that every time it comes to the battle with Arthas, people start using this stupid argument about ''divine intervention'', ''deus ex machina'', ''divine miracle'' and so on.
Enough. This is another dumb myth as avatars of the Old Gods or something like that.
Light is not a god, Light is just a power. In most cases, it is necessary to use the Light correctly, but Benedict could use the Light only with the help of willpower, without faith (Chronicles). Also, if the Light is god, then why does it allow guys like the Scarlet Crusade use his power (I know that Elune also once allowed the Horde to use her power, but this is a completely different case)? If he is a god, why didn't he just destroy Arthas himself? Why did you have to wait and let so many innocents die?