When evil is good (2 Chronicles 21-23)

Opposites are funny things.  In order the enjoyable to exist there also must exist the boring, for how can we know what it is to enjoy something if we've never been bored?  How can we experience love if we've never experienced hate?  Likewise, how can we know good without the experience of evil?  The house of Judah experienced evil in the reign of Athaliah, and it was there experience of evil that perfected placed them to embrace good when it became available to them.  They knew what it was like to worship Baal and to have a ruler who was a dictator.  In response to their experience, then, they welcomed Joash with open arms and they were ready to accept the covenant from Jehoida the priest to be the Lord's people.  The aftermath of such a decision was a drastic return to the course that the Lord had in mind for Judah from the beginning.  To me this story begs the question: if the people of Judah did not experience evil, would they have been willing to embrace good?  Sometimes evil is good because it drives people back to the Lord.  This one such situation.