Number of executions
Burning of three witches in Baden, Switzerland (1585), by Johann Jakob Wick.
Burning of three witches in Baden, Switzerland (1585), by Johann Jakob Wick.

Estimates of the numbers of women, men and children executed for participating in witchcraft vary wildly depending on the method used to generate the estimate. The total number of witch trials in Europe which are known for certain to have ended in executions is around 12,000

Some sociologists have attributed the occurrence of witchhunts to the prevalent human tendency to blame unexplainable occurrences on someone or something familiar. For example, Europe relied heavily upon agriculture during the period of the witch hunts; if there were large scale crop failures, the consequences would very likely be disastrous. Crop failures often correlated with the occurrence of witchhunts, leading some sociologists to suggest that communities often took out their anger about a lack of food on community members who were unpopular (witches.) This can be paralleled in more recent examples such as the Nazi use of anti-semitism to apportion blame for economic problems. A perception of moral righteousness, by the community, is a necessary element that enables rationalization. This, however, is only one element in a complex tapestry of factors leading to the events in question.

link:http://en.wikipedia.org/wiki/Witch-h..._of_witchhunts