These murders are nothing like the shootings at Charli Hebdo and a kosher market earlier this year. In those cases, the attackers had some rationale, however perverted, behind their attacks. We could comprehend their thoughts, even as we rejected them as outside the bounds of civilized behavior. But last Friday's massacre lacks even the tenuous, tortured logic that gave rise to last January's shootings. These suicide attacks were nothing other than acts of terrorism. They were not retaliation for French military actions in the Middle East, nor were these attacks a surrogate for attacking America. I think that ISIS wanted to use these actions to draw radicals in the Muslim world to their crazy cause, to show that they are more extreme than Al Qaeda. No matter how barbaric we think these attacks were, we can't effectively respond to them without knowing both how and why they were done.