36. "also, where evolution is concerned everything has a purpose" In response to In response to 33
The very notion that group differentiation is an automatic process *strongly* implies the existence of different strategies for interacting with groups
And it can be safely assumed that the strategies for dealing with ingroup members will be mote altruistic than strategies for dealing with outgroup members.
I probably got a lot more out of that article than someone less familiar with evolutionary concepts.