It's kind of hard to blame Bush for the hurricane, even if you do think he's full of hot air and his head is a low-pressure zone.
It's not difficult to blame the Bush Administration for short-sightedness and lack of effective response, but the blame is going to be sliced pretty thin; many organizations and people deserve a bit. There were several days warning, and a serious lack of preparation.
The anger surrounds politicians' (not just Bush's) readiness to congratulate themselves for how successful the (nonexistent) relief effort already is. Anderson Cooper sliced Senator Landrieu a new one for participating in this love-fest while her constituents suffer.
The real big one, though?
I don't think anybody anticipated the breach of the levees. -- G. W. Bush.
Every news outlet in the nation was talking about it in the days leading up to the hurricane.
New Orleans officials have been talking about it for years.
The "Hurricane Pam Exercise" anticipated much worse, a storm-surge that was higher than the levees in the first place.
FOX did a TV Movie that ran on F/X in June called "Oil Storm" that's remarkably prophetic. Maybe those loudmouth showbiz folks know more than we give them credit for.
The clear evidence, though, that everybody but the administration knew that the levees were a clear danger? Mr. Bill anticipated that the levees might be overrun. When a clueless animated piece of clay is dramatizing New Orleans flooding, the "not anticipators" are in the minority.