Board Thread:Warhammer 40k General Discussion/@comment-5846164-20130211074649/@comment-2253300-20130222041356

It is. Though that doesn't quite explain it. After all the Warp, and creatures baring sensitivity to it have the proceeded the genesis of even the oldest of the Chaos Gods. If your hypothesis was correct that would mean that living being felt no fear up until the Middle Ages on Earth.