Since 2001 the U.S. has expended enormous efforts to kill a handful of men — bin Laden, al-Zarqawi, al-Awlaki, and this weekend, Jihadi John. Others, many without names, were killed outside of media attention, or were tortured to death, or are still rotting in the offshore penal colony of Guantanamo, or the dark hell of the Salt Pit in Afghanistan.
And it has not worked, and Paris this weekend, and the next one somewhere else sometime soon, are the proof.