You know, witches can float, and they are burned. Wood can float and is burned. Therefore, witches must be made of wood. Ducks can also float, which means it must weigh the same as wood. This leads to the conclusion that if a woman weighs the same as a duck, that means she's made of wood, and therefore a witch. It's completely logical!
In England in the middle ages, suspected witches were thrown in the rivers, if they floated they were a witch and were subsequently burned, and if they didn't, they weren't a witch but were dead anyway.
You just have to look at the influence of the Catholic Church in western Europe up until the 1500s or so; whatever the Pope said, went. If the Pope said that a country was too powerful and needed its influence to be restricted, the other countries around about would jump on it and act upon it.
In the past food contaminated with a natural substance similar to LSD would make people act crazy. These cases were confused with witchcraft
People didn't know what was making them alucinate. This took place in Salem, a town in the USA. To test if this was a case of demonic possession, they made a girl high on LSD pee on a piece of bread. A dog was fed the bread. The dog started to act crazy. At the time this was clear evidence of demonic possession