What was the reasoning for the attack of 9/11

On the day of 9/11, the Taliban foreign minister told the Arab television network Al Jazeera: "We denounce this terrorist attack, whoever is behind it." The United States requested the Taliban to shut down all al-Qaeda bases in Afghanistan, open them to inspection and turn over Osama bin Laden.

they were apparently acting in retaliation for America’s support of Israel, its involvement in the Persian Gulf War and its continued military presence in the Middle East.