Yes, they exist, in the same way that there probably really were people practicing witchcraft in early modern Europe. The existence of witches doesn't mean they were nearly as prevalent or as powerful as the witchfinders claimed, nor does it mean that the witchfinders could identify witches with any accuracy.
Yes, they exist, in the same way that there probably really were people practicing witchcraft in early modern Europe. The existence of witches doesn't mean they were nearly as prevalent or as powerful as the witchfinders claimed, nor does it mean that the witchfinders could identify witches with any accuracy.