“why doesn’t the western world exploit the deep differences between the major flavors of islam”
Because they all are united in their hatred of the infidels. Only when the infidels are subjected in their own lands, and they are too weak to attack elsewhere, do they really get to work killing each other.
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I think that the Shiites under the Mahidi are not only obligated to bring all humanity to Paradise (human extinction), but the last two are obligated to kill each other ...
As you can see, they are natural allies of the voluntary human extinction movement mentioned on FR this weekend.