AN: This is based around the scene from The Avengers when the Avengers (minus Hawkeye) discuss Loki.
"So what do we do about Morgana?" Merlin asked the room at large. They were planning their assault on Camelot and were discussing all possible options. Morgause would most likely be someone who would go down fighting but Morgana was possibly another story.
"I don't think we need to worry about Morgana. Her mind's like a box full of cats, anyone can see she's crazy." Gwaine offered; you didn't do what Morgana did if you had a fully functioning mind and weren't an absolute lunatic.
Arthur frowned at Gwaine. "Mind how you speak. Morgana might be beyond reason but she's still a citizen of Camelot. And she is my sister." Arthur admitted, finally saying those words for the first time since he and Merlin overheard Morgana snarl that confession to a stunned Uther.
"She killed eighty people in the past seven days." Gwen reminded flatly. As much as she hated to admit it, Morgana was beyond all help.
"She thought she was adopted." Arthur retorted.