[Aidou raises a brow at this and sounds slightly skeptical.]
Were you not just the one talking about confidence? It seems you have some insecurities of your own that you need to deal with instead of trying to intervene on your friend's behalf.
[Snort of derision and sarcasm.]
Killing a Level E is not murder. They're animals who are a danger to society and have to be put down before they kill anyone. I don't think it constitutes murder if it's self-defense [and defending an entire school filled with humans, who really weren't his concern at all, but Aidou knows he would have felt guilty if something had happened. And Kaname-sama had wanted them to do it anyway, so of course Aidou did what he needed to do].