Why do they hate us? And does that make them terrorists?

One has to wonder why five young men, enjoying all the fruits of American Democracy, would shed all of the supposed benefits of our society and travel to Pakistan to fight against American soldiers next door in Afghanistan. What does that say about us, as a nation? What does that say about our actions in the world around us? And when will we start looking inward at the causes of Nigerian banker sons boarding planes in Amsterdam and trying to kill innocents?