To make Uther or Morgause or anybody else bear or share the responsibility for Morgana’s despicable crimes, infantilizes her (I refuse to insult her by infantilizing her) and it alienates the very concept of Free-Will. Anyone with a brain and judgment is responsible of his own actions, Morgana is a grown woman, she has judgment and she’s far from being brainless. There’re two criminals that a judge doesn’t send to jail, a minor and a person mentally unfit, she’s neither of them. She is guilty.