One of the reasons that made the King hesitate over making the problems of black magic and the lycan official was because he didn't want the Holy Kingdom to get involved in this matter. Looking at the current situation, it was only right for them to intervene, since it was part of their responsibility to eliminate any dark magic users and the use of black magic.
Therefore, with Lou sneaking inside Alan's bedroom, where he had been locked up, it was completely unacceptable, especially when he suggested for him to inform the Holy Kingdom about it.
However, knowing Alan, this man- child wouldn't think that far as he only thought about himself. There was no way he would consider the consequences that would entail by allowing the Holy Kingdom to interfere with their kingdom's affairs.