Reciprocal altruism and barbarous apes

Whilst wealthy primates pillage the poor, the monkeys show us the way. Perhaps we've mislaid something along our evolutionary path. Or maybe we just chose to set it aside.

and...Apparently Neandethal technology was no less efficient than our own (in the practical business of securing game) during that brief period when we shared the same safe European home. - so I wonder what could possibly have caused their extinction.