@dyslexia,
A president trusts the people in charge of FEMA or whatever agency to do their job. As I remember, Bush patted the head of "Brownie," who may or may not have been doing a good job despite the crap going on in LA and NO government. None of us know the details on how the mistakes of the NO mayor and the LA governor affected FEMA's ability to bring aid in a timely manner.
It's so very easy to criticize - especially when it serves our purpose. Even if FEMA did add to the nightmare of errors, we know Nagin and Blanco fumbled their responsibility horribly. Maybe "Brownie" did, too. Blaming Bush, however, is just politically expedient for the peanut gallery.