Why muslim terrorists kill other muslim terrorists?

Now Islamic State is killing military of Iran. At least they are not doing it in Europe or America. It seems to be a long war between the 2 branches of muslim terrorism.

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KingofPizza2 · 36-40, M

Same reasons that the Protestants and the Catholics fought so bitterly in Europe for so long. They think the others are worshipping the right god the wrong way and they need to convert or die.

bijouxbroussard · F

@KingofPizza2 This answer.