Islamic terrorists tend to be dumb. Most plots fail, often comically. Getting someone to act on violent rhetoric and also be competent enough to carry out a complex attack is not easy. But the signal is strong and reaching a wide audience if there are spontaneous attacks, such as ISIS is generating. Be loud, reach as wide an audience as possible, whip up enough dummies such that a few will get lucky.
Progressives are now in the same class as Imams calling for jihad on the West. The dodos among their flock are now carrying out their orders. As the Cathedral withers away and the edifice collapses, the Madrasa is revealed.