The killing of Charlie Kirk has left the US and those who care about it on edge. The arrest of a suspect, Tyler Robinson, has hardly settled the nerves, not when the revelation of any supposed political allegiances could touch off a fresh round of recriminations. The fear is that the country is about to descend into a new era of political violence, becoming a place where differences are settled not with words and argument but by guns and blood. After all, it has plumbed those depths before.

The US was born in violence, fought a civil war less than a century after its founding and in living memory seemed to be on the brink of another one – with a spate of assassinations in the 1960s that took the lives of Martin Luther King, Malcolm X, Medgar Evers and John and Bobby Kennedy. That should provide some consolation, the knowledge that the country has been through this before and survived.

And yet the comfort is scant, because these are different times. For one thing, guns are even more available now than they were then: there are more than 850m firearms in private hands in the world, and nearly half of those are owned by Americans. For every 100 Americans, there are 120 guns.

For another, today’s information supply is dominated by social media, amplifying the most extreme voices and rewarding the angriest sentiments. Where once the CBS anchorman Walter Cronkite could break the news of a presidential assassination and provide sombre balm, now grief is inflamed into fury, with footage of Kirk’s horrific shooting entering global circulation mere moments after his death.

But the crucial difference is at the top. An act of political violence used to be met by a standard, reassuringly predictable response: the president would condemn it, grieve for the dead and their families, plead that there be no rush to judgment, and call for calm and for unity, insisting that Americans not give the killers what they want, which was division, but rather come together as fellow citizens of a republic they all loved. I heard versions of that speech, delivered at different moments by Bill Clinton, George W Bush and Barack Obama. On Wednesday night, Donald Trump chose an alternative path – one that proved that, as he later admitted to Fox News when asked about bringing the country together, he “

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