We look after our own. Racists do it. Revolutionaries do it. So do faiths and families, secret societies and stokvels, corporations and co-ops.We‘ve always done it; looked after the members of our tribe. Because that‘s what we are.We can pretend that we aren‘t, and convince ourselves that we are modern individuals freewheeling through an impersonal urban landscape. But that‘s not really true, because that landscape is criss-crossed with a thousand invisible fences, each demarcating the territory of another tribe.Some of the fences are barbed: race, language and politics can be impossible to get past. Religion, too, can be dicey: those who belong and those who don‘t are often kept apart like sheep from goats.Other fences are gentler. Some tribes are held together by love or by the subtle bonds of friendship. Some just like discussing books or having a drink together.But even these more tender boundaries can be inflexible. You are the friend I go to with my problems, or you are not. Y...

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