:Thus, human sacrifice was considered completely acceptable and there is evidence that not only did people willingly allow themselves to become sacrificed for the "greater good", but it was actually considered an honor to be chosen for this deed. This is all part of tribal culture, situations taht Lark, Deathy, et al, have no conception of and would recoil at the idea of these coming about. But, ancient tribes definitely could reconcile things such as human sacrifice with considering their tribe well-off. Remember, no competition for resources means that you can pretty much do whatever you want.
A read of the Spanish accounts of their conquest of
the Aztecs and Mayans is informative here.
Most of "civilization" has come a short way
from these tribes with the
breakdown of hierarchical structures.
What would keep up us from reverting back, a
backward step in our mental evolution?