I read the article today in the New York Times and felt that it was headlined a little off-topic. I think there have been plenty of outpourings of sympathy, fear, and searching for origins.

There was a horrible example of what is purported to be ISIS terrorism in Bangladesh, hostages executed and some held and then freed by counter-terrorists. And retrospective analysis of those who could be coopted into the terrorism from upper/ middle class families in Bangladesh.
As for the mass explosions and killings in Iraq there has been an outpouring of fear and sympathy, not to mention hate for the Iraqi government which can't protect its people (which is the motivation of the terror in the first place) but I'm not aware of someone taking responsibility for it as yet.

What is going on is terror of the extremist on the non-extremist regardless of religion except that there is the additional wrinkle of sunni shia hate which harkens back to the kind of thing Europe experienced in the Thirty Years war.

I still remember the Taliban targetting kids in school in a systematic mass execution.