Can't blame anyone for this natural disaster, or for under-predicting the scope of it, but what purpose, besides showing his magnificence (and selling hats  -  only $40 for his supporters) and his trophy-First Lady, what did the president learn  -  or if history is any judge  -  did he even want to learn, especially being miles away from the action?    Did his presence belie his usual willful ignorance or undo his disaster relief cuts?