>>94338459Because he didn't want to kill her, she's his niece. Iroh pretty much doesn't want to kill anyone, and he's probably the person who most appreciates how his brother has completely fucked up both Zuko and Azula's lives.
>But he sent Zuko to fight her!Yeah, but not to murder her. You're assuming too much if you think Iroh intended for Zuko to kill his sister.