User blog comment:EatsRainbows/Do you think Morgana will be good again?/@comment-4892425-20120627154042

Even if she turns good, Morgana has committed too many crimes against the Crown and the people of Camelot, including regicide (Uther) and torture and mass murder. If Arthur wants to keep his throne he has to make Morgana answer for her evil deeds - kill her in battle or capture her for trial and execution.