Originally Posted by
Dannihilate
Giving Arthas the same hamfisted "retcon" secret motivation that they did to both Sargeras and Illidan was the worst thing about the newest Chronicles book and completely unnecessary for his character. He doesn't need some crap redemption arc where he was doing the wrong thing but ultimately for the right reasons. The Lich King was an evil, sadistic, sociopath who delighted in bringing pain and suffering upon everyone he crossed paths with and that's why we loved him. Saying that he was secretly torturing everyone and damning their souls just to raise an army to fight the Legion is dumb, and it's double dumb since the plague of undeath originated with the Legion in the first place.
Besides, killing every living creature on the planet and raising them as undead to make an army is an incredibly stupid strategy, especially verses the Legion. That's a war of attrition that he would lose. The Legion army is constantly growing AND their fallen soldiers regenerate in the Nether and then just come back, whereas Arthas' army would just get whittled away until it was gone, since if everyone is dead, there's no one left for him to raise for new soldiers.