User blog comment:123Action/A better end to Morgana/@comment-5674726-20130224000928

Morgana had no idea that Arthur was supposedly going to unite Albion, restore magic, bring about a golden age, etc. From her perspective, Arthur was continuing the persecution against magic users. If she, as High Priestess of the Triple Goddess, was kept up to speed on the Disir's judgement, she knew that Arthur refused to accept the Old Religion, even when he believed that the life of one of his knights was at stake.

Maybe she wouldn't have believed it if she was told - not by Merlin, she had no reason to have the slightest faith in him, it'd have to be somebody with more credibility - but who's to say what she would have done if she'd believed that it was possible that Arthur could come to accept magic?