There is a long tradition of simplifying politics into an adversarial game between two opposing tribes, the left and the right. This model has certain attractions. It gives you political friends and opponents, and makes it pretty clear which are which. Of course this model, often deployed subconsciously, has always been highly misleading. But recently, in the Western world at least, it’s become outright dangerous. It blinds moderates, from both the left and right, to the threat from their ‘own’…