Originally Posted by
Amnasty
I don't think the amount of people some has killed has anything to do with invoking the light. I'm the Scarlett Crusade is able to invoke the light and I'm sure they have killed many people who weren't demon or undead. Dreanei have killed many orcs, they have nothing but paladin protecting their cities and they are still able to invoke the light.
All causes are righteous if you allow yourself to see both sides of the issue. Illidan saw the innocent he killed as did Arthas, as a necessary means to an end. What are a few thousand innocent people when we measure it against the weight of every being on the planet...even more so the entire cosmos.
The light may very well embrace illidan because he has a pure reason to his madness, why not lend the most qualified legion killing being unimaginable power if it means saving the cosmos. If it means ending the immediate threat of the dark titian.