User blog comment:Fallon Perridon-Loredo/A hunters heart/@comment-5036924-20111211125131

Merlin obviously does have a track record of being right, but I guess it's a bit tricky for Arthur. If you imagine someone you've always loved and trusted, like a parent (or indeed an uncle), and then imagine your best friend coming and telling that your parent was actually a murderous liar, you'd probably defend your family member no matter how much you trusted that friend.