Thirteen dead and 28 wounded would be a bad day for the U.S. 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 in the safety and security of home by, in essence, the same enemy – a man who believes in and supports everything the enemy does.

And he's a U.S. Army major.

And his superior officers and other authorities knew about his beliefs but...