The horror has shown how thin the line is that divides civility from barbarism.

Guest op-ed by Miguel-Anxo Murado, a Spanish author and journalist @ NYTimes.com, Aug. 18

[....] it was in Las Ramblas of Barcelona, standing guard on a rooftop as a volunteer during the Spanish Civil War, that the British writer George Orwell was struck by a realization that would ultimately lead him to write “1984,” his enduring denunciation of totalitarianism and the politics of fear.

On Thursday, the terrorists began killing people precisely on the spot of Orwell’s epiphany. By the time the vehicle had ran its course, it had left a half-mile trail of pain. Already, yesterday, that scar was covered with a tribute of flowers. It occurred to me that many of them may have come from the same kiosks hit by the van.

“If you can feel that staying human is worth while,” wrote Orwell, “even when it can’t have any result whatever, you’ve beaten them.”