There are many fairy tale characters that are actually real and the order has had to take them away because their powers could easily be used for the wrong reasons. Some of this creatures have been captured by governments and the order has been forced to send their most talented agents to retrieve them. The order knows that the human race is not able to live in harmony amongst each other and this is the main reason why they would use any special powers to keep their enemies living in fear.
Humans have been using nuclear warfare for a long time now as a way to threaten their enemies, but some fairy tale characters can do even more harm by getting inside the minds of humans and controlling their actions. That is probably the most serious threat that they pose if they are used and manipulated by humans.