The British Druids, for example, were portrayed by them as committing wide spread human sacrifice. This appears to have been an attempt to justify their extermination. The reality is that the Druids were scholars, lawgivers, poets and clergy. As such they were natural leaders that the Romans had to kill in order to take over Britain. There is no evidence that human sacrifice was practised by the Druids, yet almost 2000 years later the myth persists.
Witchcraft can have at least two, mutually incompatible meanings.
The anthropological meaning of witch is someone outside of tribal society who works magic. One point of note is that, since the aboriginal religions included goddesses who were at least the equals of the gods, Witches tend to have deep respect for women and children. This makes modern Witchcraft popular among some feminists. Perhaps it might be interesting to consider wording your criteria in terms of sites that promote principles of love, honour and respect among people, and family members in particular. I think that might be a clearer indicator than trying to list all possible violators of those principles.