My first reaction when I heard about the deaths of Jay Austin and Lauren Geoghegan was “what a pair of bananas”. They were killed while cycling in Tajikistan – which sounds as reckless as self-catering in the Congo – and left behind a manifesto of sorts that has been mocked as the height of liberal myopia. “Evil,” Mr Austin wrote, “is a ­make-believe concept we’ve invented to deal with the complexities of fellow humans holding values and beliefs and perspectives different than our own.”

On July 29, that thesis was tested and disproved when they were spotted on the road by men pledging allegiance to ISIS. The monsters ran Jay and Lauren down with a Daewoo sedan.

“That’s ironic,” said some: which meant, cruelly, “they kind of had it coming.” But on closer reading, I found that the right-wing media – here’s a surprise – had got nearly every bit of this story wrong. The pair were not out to prove humanity is spotless; they were rooting for adventure. They weren’t hapless innocents; they were experienced travellers who’d been to Africa and Europe. They weren’t travelling alone; the attack killed four in total. And Tajikistan isn’t ISIS territory; the US State Department gave it a low-risk status.

More importantly, Jay and Lauren’s faith in humanity was based on experience. According to the New York Times, one day on their journey a Kazakh man stopped his truck and gave them ice-creams. On another, a family showed up outside their tent to serenade them with stringed instruments. So, no, these were not idiots, and more fool us for assuming they were. Jay and Lauren were good folk who took a gamble on the world and lost.

You could almost call them saintly, although not as Catholics would wholly understand it. One feature of many of the best Catholics I’ve known is radical trust: a willingness to expose themselves to risk and put themselves at the mercy of others.

But that doesn’t mean we shouldn’t be wary of evil. Ours is a faith of angels and demons: the best and the worst is contained within.

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