Image after image of unrelenting sorrow, layered one atop the other like a deck of haunting cards. A baby held aloft, inches above a sea of desperate faces, gasping for air. The dead left where they've fallen, in plain view, robbed of even the simple dignity of a shroud. Survivors waiting, then begging, then fighting, finally, over food and water. Here. While the images of natural disasters and man-made ones alike, from Sri Lanka or Baghdad, cause despair, the pictures from New Orleans inspire not just helplessness, but disbelief. The richest, most powerful nation in the world can build schools,...