User blog comment:Epakrios/Plot holes/@comment-5619706-20140123133436

The one problem I have with Cain's story, is if he became a demon right after killing Abel, how is he credited of being the deadliest demon to walk on earth and bringing so much chaos and destruction when the human population around the time he became a demon was only, I don't know, his own family? If he started killing right then and there humanity would not have survived.