Cooperating = complying with social norms. Social norms are learned behavior. Many social norms are quite at odds with evolutionary psychology.
Adults have learned more than children; and children must learn before they
are able to comply with social norms.
You may find it diffucult to "cooperate" with adults who were exposed to
greatly differing social norms; as may hapless sailors have discovered.
Social dysfunctions aside, I really don't see it being any more complicated
that this.
Adam
