Thirteen dead and 31 wounded would be a bad day for the US military in Afghanistan, and a great victory for the Taliban. When it happens in Texas, in the heart of the biggest military base in the nation, at a processing center for soldiers either returning from or deploying to combat overseas, it is not merely a “tragedy” (as too many people called it) but a glimpse of a potentially fatal flaw at the heart of what we have called, since 9/11, the “war on terror”. Brave soldiers trained to hunt down and kill America’s enemy abroad were killed...