Tipjar has a fascinating post today regarding the roots of terrorism. The article traces the roots of the modern jihad through to Bin Laden (and wahabism). The real key why they hate us -- we are not believers, we do not live as the prophet decreed. We do not have a cultured civilization (the ideal would be middle ages Spain under Moorish control).
Read the post and the attached article. Watermelon and bad haircuts led to the planes of 9/11. We are in a global war of culture, readers. It is truly us or them.