It's been more than two months since the tragedy in Tucson stunned the nation. It was a moment when we came together as one people to mourn and to pray for those we lost. And in the attack's turbulent wake, Americans by and large rightly refrained from finger-pointing, assigning blame or playing politics with other people's pain. But one clear and terrible fact remains. A man our Army rejected as unfit for service; a man one of our colleges deemed too unstable for studies; a man apparently bent on violence, was able to walk into a store and buy a...
