Answer the question!

( She won't back down, either. ) What would have happened if you hadn't killed them? What would the consequences have been?

( No. If it hadn't been done, and something had gone wrong, then they'd be tearing themselves apart for the lives lost on their side. ) I means that you have a conscience, that you can do better in the future. It means that you have a reason to keep fighting, because you still value life.