When tragedy strikes, as it did on September 11, 2001, it is only natural for us to look for higher meaning amongst such chaos. As empathetic and curious beings, we ask standard questions. Why did this happen? Who could have done this? Will there be justice? Can I help? And, most importantly for our purposes, what could motivate someone to kill themselves (and near 3,000 innocent people) in such a brazen act. Self preservation is of course, the most powerful instinct. More..