You know, I've never really gotten why people found it so strange for her to try to kill Light. The guy is pondscum. He's the lowest of the low. He's a child-killing serial rapist that flaunts what he's done. He's not crazy, like Joker, he's just vile and throws it in your face. I have no problem buying that some other villains would try to kill him simply because he can stir up disgust in even the hardest of hearts.