Either we break the polygynous, patrilinear clan, or we adopt the same structure against them.
The Boston Marathon Muslim bombers (see what I did there?) were identified and corralled relatively quickly. The reason for the quickness is this: Outbreeding.
To put it more conventionally, a cultural-cum-genetic predisposition toward love-based monogamous marriage that strengthens outbreeding and restricts inbreeding is what helped authorities identify and track the bomber suspects.
By limiting inbreeding, a phenomenon which usually occurs via cousin marriage, the circle of trust is widened. When police ask for tips, this built-in higher level of trust is effectively an enlarged witness pool, ready to jump in with assistance.
Clannish societies, like Chechnya, are more inbred societies. People there look out for family first, the general public good a distant second. Had the Chechen Muslim brothers (see what I did there again?) committed their murderous act in Chechnya, where clan blood is thick and civic-mindedness is thin, it is likely that they would be on the run…
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