How Israel spots lone-wolf attackers

HIS last Facebook post was perhaps the only clue of Raed Jaradat’s yearning for vengeance: it showed a Palestinian teenager lying dead with her headscarf soaked in blood and the message “Imagine if this were your sister.” Dania Irsheid, 17, had been shot by Israeli security forces in October 2015 at the entrance to the Ibrahimi mosque (Jews call it the Cave of the Patriarchs) in Hebron. Police said she had tried to stab Israelis; Palestinian witnesses say she was unarmed.

The next day Raed, a 22-year-old accounting student from the town of Sair, near Hebron, went to a checkpoint nearby and stabbed an Israeli soldier in the neck before he, too, was shot dead. Later his 19-year-old cousin, Iyad, was killed during stone-throwing clashes with Israeli troops. Raed and Dania had never met but, at his funeral, their fathers said their children should be married “in Paradise”.

Such is the rhythm of the Palestinian “stabbing intifada”. Since its outbreak in late 2015, there...