[Harmless Teddy Bear]

Go back far enough, and virtually all societies have engaged in human sacrifice and probably cannibalism too.

True.

But there also were such a thing as serial killers in the past as well.

Generally with human sacrifice there is a great deal of ritual about the burial as well as the death.

Face down in the midden does not seem to fit this kind of ritual at all but we know so little about how they thought as they lacked a written language.

[jimtorr]

Two Thousand years ago is Roman times. The Roman sources, as far as I know, do not reference human sacrifice in SW England, where the Durotriges Tribe was located.

The SW Britannic tribes of the time did have a written language, although, as far as I know, they did not use it much. It may have been Gaulish, Greek or even Latin.