I know too much to not believe in witches and black magic.
(media.scored.co)
Witchcraft is technically utilizing demons to perform sleight of hand (or tentacle, or claw, or whatever it is the demon feels like having that day), which is why actual witches (which were rare) were punished so harshly. Of course, after the Reformation, the Inquisition, who had the only good track record for rooting out actual witches and sparing poor schizos from the pyre, lost the ability to do this in many countries. What resulted is people randomly accusing anyone who was a bit weird of being a witch, and then subsequently igniting them without any inquisitional oversight (which usually involved actually checking if any demonic activity was taking place).