Unlike the Darklyte, which had almost succeeded in corrupting the entire world, this new threat had a different goal in mind. Instead of making people evil, darkening their souls, it's goal was to take away humankind's innocence and chastity. If it succeeded, the world would be full of sex-crazed people, no matter what age they were. An entire world of sexist sluts.
Being of pure heart, Santa and his elves wouldn't stand for that. But was Jon totally against it?