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The stated reasons for 9/11 were the presence of US troops on holy muslim ground, the continuing war against the Iraqi people and lastly the Israeli treatment of the Palestinians. Pretty much sounds like they had some policy differences which they felt they could only get addressed by use of force. Historically small groups resort to terrorism against a large unresponsive state. That would mean policy = political problem. Also it emphasizes that war begets more war. No Gulf War One, no troops on Saudi land, no 9/11.