Here we go. It has always been difficult for Westerners to understand a murderous, illiberal ideology of Islamist extremism. The torturous course of self-examination in which liberals engage in the wake of this kind of a terrorist attack has become a familiar ritual. This customary practice following the deadly assault on the offices of Charlie Hebdo began just 24 hours after the bloody attack. In a profile published in the French center-left paper Le Monde, one of the two French brothers responsible for the massacre of 12 and the injury of 11 others on Wednesday reportedly cited the abuse of...