The kindness of strangers
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Our co-operation allows us to have a division of labour and exchange—someone mends the fishing nets while another collects coconuts—and the specialisation this allows is almost certainly responsible for our rapid spread around the world.
No other species does anything like this. The co-operative hunting seen among male chimpanzees is largely done among bands of (genetic) brothers. Ants co-operate, and they are capable of raising sophisticated armies, and of deploying them in complex ways against other ant armies. But ants are effectively genetic clones of each other and so don’t mind giving aid or even their lives to help the collective.
Co-operation among unrelated humans is a different matter. If you help someone and they don’t help you back, you lose. Co-operative societies can soar to great heights, but they can cost you dearly, as when cheats take the spoils of co-operation without returning the benefits. This means that humans have evolved sensitive mechanisms to discriminate between people likely to share their co-operative values from those that do not.
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The kindness of strangers
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