[Again, the response will be a while in coming. He's making her think about Hama, how she used bloodbending to escape -- a good reason if a horrible action -- and then how she kept using bloobending for revenge on innocent people. And he's making her think about Zuko, and how he said he did everything that he did for his father's approval. They both thought they had good reasons, but what they did... And somewhere in the back of her mind she's examining her own actions in this light as well. If it's visible through the journals, he'll see a few false starts before she actually responds.]

I know that sometimes people can do bad things for what they think are good reasons. And in that case -- what does it matter? All you can do is stop them.