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One may draw several conclusions from this lack of concern and studied indifference, but I think that it is a mix of indifference and fear. Indifference to any insult or attack on Christianity, and fear of becoming a target of "radical" Muslims who are anything but indifferent and apparently utterly fearless in spite of the U.S. and Western powers assertion that they are "cowards."
To paraphrase a popular saying, "sometimes history is made by those who just blow up." If they want it more than we do, they win.