I can't see how anyone, Democrat or Republican, FUBARs worse than Blanco. Nor do I see what his fiscal policies (CATO A-lister this year) have to do with disaster response. We saw a mini-example of what he'd likely do with Gustav back in 2008. Plus organizing his own private relief efforts in 2005 IOTL.
As for Bush hates blacks: so absurd as to be laughable among most voters, given his record. But given the reports you hear of Asian-black tension in schools among other places, I really don't see how having Jindal in office mitigates the "Bush hates blacks" meme. As I said, it depends who the public assigns responsibility to.
The Guard is under his control. Evacuation is shared by state and local authorities. IOTL the problem was not evacuating because Nagin refused to declare a state of emergency. If Nagin does that by listening to the meterologists, Jindal and the Feds and evacuates, then there will be few, if any casualties. Best-case scenario, if the levee rebuilding was initiated in 2004, then there's only* property left.
*Not that property is insignifcant, far from it. But better property than loss of human life.