User blog comment:It's Good to be the Queen/5 x 11....why Mordred turned/@comment-5577678-20121208182101/@comment-5674726-20121208183656

Magic is still illegal in Camelot and, despite Arthur's promise to treat the Druids with respect, Merlin still found it believable that a Druid boy would have to sneak into Camelot to secure help for a sick child, so it's probably safe to assume that he hasn't kept this promise. Arthur also refused to restore the Old Religion, a choice that the Druids may be aware of.

He hasn't given the Druids, or others with magic, reason to believe that they'll be better off under his reign than they were under Uther's. It's past time for that to come back to bite him.