[Riku8]

Well first of all he can't take care of Melo first because he doesn't know of his existence, and also melo hasn't "taken away innocent lives" he merely kidnapped the director, light killed him.(Granted that was pretty much his plan he still didn't directly kill him) In all honesty I could actually see him killing her if he thought he couldn't save her without exposing himselfObviously we know he doesn't kill her in the end