From families to nations, communities to political parties, groups are central to society and our lives. In large part we see the group, community, club as a positive thing. But, every 'us' also creates a 'not us', a 'them'. To have a friend is also to identify those who are not friends. What is unknown is how to create groups without at the same time creating outsiders. Neuroscientific studies show we are hardwired to feel fear when encountering someone from outside our group. Moreover, Cambridge studies show hostility towards outsiders increases when our group is in decline. Perhaps the reason three quarters of Americans want tighter border control, and over half want immigration reduced. And that in an age of tribal identities division is deep and profound.
Can we form close bonds with a group, without creating aggrieved others who feel excluded? Should we be sceptical of all groups and see them as potential vehicles of privilege and conflict? Or should we see allying with others and feeling at one with them, love, as the most important human state, and seek to apply the principle to everyone?