andie nachgeborenen : They don't have to exist for a reason (that's the spandrel theory), but speraking sociobiologically they pose an interesting puzzle that calls for explanation.
^^^^ CB: Agree except I would substitute the word "biologically", or "biological anthropologically" (:>)) for "sociobiologically". It would be a crime to let sociobiology lay some special claim to this issue. Dialectical biology is as interested in this issue as all others.
Materialists should be interested in this issue, given the rightwing theists assaults on Darwinism today. There's a "reason" that _The Origin of the Species_ is on a rightwing list of most harmful books of the last two centuries.