# 演化心理學更推論,在演化大賽中,最適合存活下來的人類族群,並不是只懂得愛,也非只有恨。得分最高的,是對自家族群有濃厚的愛與忠誠,對群體之外的人類,則可以毫不手軟,甚至是恨意濃烈,因為這樣的團體,對內會緊緊團結,對外則會狠心滅絕鄰近部族——《灰階思考》
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