Today’s suspects: Suicide , terrorism, material failure (structural). And that’s how security policies can work against their purpose. Aka , hearthbleed bug. http://www.theguardian.com/world/2015/mar/24/germanwings-plane-black-box-found-as-investigators-reach-crash-site http://time.com/3756610/germanwings-crash-safety-a320/ http://www.aljazeera.com/news/2015/03/pilot-locked-cockpit-germanwings-crash-150326064729556.html