Greenfield discusses Islamic terrorism in term of the tribe or clan.

A Tribal War in Boston
April 22, 2013
Posted by Daniel Greenfield @ the Sultan Knish blog

"Terrorism, like urban crime, is one of those things that you're not supposed to think about too much. It's fine to talk about your emotions after a bombing or a mugging. You can even share stories and eventually learn to laugh about it. What you cannot do is talk about where it comes from except in the vaguest terms of social conditions. Like pollution from industry or corruption from government, it's one of those toxic spinoffs of our modern society. It's just there and we don't much talk about it.
. . .
Forget the great debate between whether people kill people or guns kill people. The conclusion reached by most governments before your grandfather was born is that social conditions kill people.

The Tsarneav brothers are being talked about in the same way that most serial killers are. "They were so nice. What made them do it?" It's the empty repetition of a question to which no one really wants to hear the answer. "What could have made them do it?" isn't a genuine question, it's a ceremonial washing of the hands. A ritualistic statement that we couldn't have known anything was wrong. How could we? They were so nice.
. . .
Back in the Tsarneav homeland, clans fight each other to the death, wiping out entire families to the last child
. . .
What is a Teip you might ask. A Teip is a Chechen clan. Everyone has one in Chechnya including foreigners. To have a place in the society, you must have a Teip of your own. Otherwise. "This man has neither a Teip nor a Tukkhum."
. . .
But what does all this Teip talk have to do with the modern world? It is an article of faith that any number of people can come to this country and bring their diverse Teips with them, and aside from some picturesque native foods and unique post-colonial grievances, they all become part of the tapestry of Teip America.
. . .
The American mosque is an outpost of tribal Islamism. It's an artificial community that primes members of tribal cultures to identify with and defend a religious Teip. That is the system that the Saudis have invested a good deal of money into building because it provides them with an endless flow of cannon fodder.
. . .
multiculturalism ... is a clumsy alliance of Teips pretending to represent all the Teips. Multiculturalism, like most forms of liberal consensus, shut out any contradictory realities.
. . .
Tamerlan found his Teip in Islam. So have many Islamic terrorists and political Islamists. Their Teip is not one that we talk about. It is the Teip that is at war with all the other Teips. It is at war with the basic idea of Multiteipism that the entire broken system it is trying to topple over is based on. And the story is the same in Europe. It is the same in Canada. It is the same in Australia.

It is the same everywhere
. . ."

http://sultanknish.blogspot.com/2013/04/...-in-boston.html

FYI "Tukkhum are systems of social organisation in traditional Chechen society. A tukkhum is a grand alliance of familial clans or teips"
https://en.wikipedia.org/wiki/Tukkhum