Why do McCain and Bush disrupt emergency services during the hurricane - for their photo ops?

Remember what happened the last time George Bush staged a photo op during Katrina? It halted food delivery to the hurricane victims. And don't forget, now that McCain is the GOP candidate, it takes a 9-car caravan to buy him a cappuccino at a Starbucks. McCain and Bush are going to make a disaster of a disaster. Why are they going to the region at all? If they really want to help, if they really wanted to help, they'd be chairing task forces in Washington, not posing for photographers in Louisiana, Texas and Mississippi.