They are very, very wrong. There are plenty of things wrong with this town, none the least that the girl doesn't seem to want to stop stalking Hansel.
It's getting creepy.
As well as that, the witches are behaving in an irregular pattern, taking children in a way neither of them have seen before, and even though it's a pattern that's a challenge to solve, it's not as hard as they first thought.
It's just another Hunt.
The children will be returned home safely, because they are innocent.
The disbelievers will be proven wrong, those that believe they can do it themselves killed.
And the witches will die.