Welcome to the post-Hobbesian dystopia: a war of everyone against themselves.

Guardian |  What greater indictment of a system could there be than an epidemic of mental illness? Yet plagues of anxiety, stress, depression, social phobia, eating disorders, self-harm and loneliness now strike people down all over the world. The latest, catastrophic figures for children’s mental health in England reflect a global crisis.

There are plenty of secondary reasons for this distress, but it seems to me that the underlying cause is everywhere the same: human beings, the ultrasocial mammals, whose brains are wired to respond to other people, are being peeled apart. Economic and technological change play a major role, but so does ideology. Though our wellbeing is inextricably linked to the lives of others, everywhere we are told that we will prosper through competitive self-interest and extreme individualism.

In Britain, men who have spent their entire lives in quadrangles – at school, at college, at the bar, in parliament – instruct us to stand on our own two feet. The education system becomes more brutally competitive by the year. Employment is a fight to the near-death with a multitude of other desperate people chasing ever fewer jobs. The modern overseers of the poor ascribe individual blame to economic circumstance. Endless competitions on television feed impossible aspirations as real opportunities contract.

Consumerism fills the social void. But far from curing the disease of isolation, it intensifies social comparison to the point at which, having consumed all else, we start to prey upon ourselves. Social media brings us together and drives us apart, allowing us precisely to quantify our social standing, and to see that other people have more friends and followers than we do.

As Rhiannon Lucy Cosslett has brilliantly documented, girls and young women routinely alter the photos they post to make themselves look smoother and slimmer. Some phones, using their “beauty” settings, do it for you without asking; now you can become your own thinspiration. Welcome to the post-Hobbesian dystopia: a war of everyone against themselves.