"I was in Afghanistan when Bush was elected. My father was so happy. This is the kind of President he needs - one who will attack and spend money and break the country." - Omar bin Laden, Osama bin Laden's son.
The government wants us to believe the bin Ladenites attacked the US for religious reasons. While many of them are religious radicals, what motivates their terrorism is political radicalism. Government doesn't want us to know that because then we would begin to ask questions about what political actions of the US incites them to violence.
Full video: https://www.youtube.com/watch?v=HWmpmP7H41Q&t=1113s