That's such a simplistic understanding of the situation. The Taliban really only concerns itself with Afghanistan. They are a bunch of Sunni Muslims that want to establish sharia law in their own country. Are their some of them that also join groups like al-Qaeda? Sure. But their goals are different. They are backwards and brutal, and I have no doubts that they want to see the US fall, but they are functionally different from al-Qaeda. The Taliban didn't attack the world trade center. They did allow a predominantly Saudi Arabian terrorist group to take refuge there because they share similar values.

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