Take a step back and it’s a no-brainer: If you want a healthy society, you need a spirit of unity. As we saw in London during the Blitz – often romanticised for its fabled ability to ‘pull together’ – if citizens feel they are part of a national family, they can maintain their morale even in the face of great adversity.

The same is true in modern times. It must surely be the case that, the more people feel a meaningful part of a nation, the less alienation, disenfranchisement,........

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