Genetic relatedness predicts how much humans help one another.

Evidence

First is kin selection. Hamilton’s rule specifies that genetically related individuals cooperate with each other—and by doing so favor the spread of their shared genes. From social insects to social apes, individuals help others to the degree to which the recipient and the helper are related and the benefits of helping outweigh its costs. This logic also applies to us humans. It should come as no surprise to you that, the world over, a large share of blood, body organs, money, food, and time, are donated between close family members in a manner proportional to the degree of genetic relatedness. — Norenzayan, Ara, Big gods - how religion transformed…, 32

Categorization

• DEFINE: Defines Hamilton’s rule and kin selection precisely, establishing the baseline cooperative mechanism that Big Gods must extend beyond.
• XREF: Baseline against which the fumi-e trampling and apostasy analysis operates: kin selection alone cannot sustain Rodrigues’ helpers in the novel, so the omniscient-gaze mechanism must substitute for blood bonds among strangers.