Someday, I have no doubt, the dead from today's wars will be seen with a similar sense of sorrow at needless loss and folly as those millions of men who lie in the cemeteries of France and Belgium - and tens of millions of Americans will feel a similar revulsion for the politicians and generals who were so spendthrift with others' lives.

Even [Ernst] Hemingway, perhaps the most intentionally non-political of American writers, became passionately partisan during the Spanish Civil War.

If your real wages are declining, your job is at risk, you fear your children will be worse off than you are, it's tempting to want to blame it all on an easily identifiable target: Muslims, immigrants, refugees, blacks, Jews.

All of us living in today's world are facing an enormous crisis - arguably the greatest that humanity has ever faced - in the form of man-made global warming; one can't be neutral at such a moment. It's like claiming to be neutral if you're living in Germany in 1933.

One of my favourite contemporary fiction writers is a Texan, Ben Fountain. His extraordinary novel, Billy Lynn's Long Half-Time Walk, all takes place within the half-time show at a Dallas Cowboys football game. No one has better summed up the American appetite for spectacle, the link between sports and politics, and the absolute madness of George W. Bush's Iraq War.

A pioneer in this genre [ writing about the refugee crisis] : the book A Seventh Man, by the great John Berger, decades ago evoked the lives of migrant workers in Europe.

How many really great writers are there who are totally non-political? You can hear the French Revolution in the poetry of [Percy Bysshe] Shelly and [John] Wordsworth; you can sense the vast inequalities of Tsarist Russia in [Anton] Chekhov and [Lev] Tolstoy.