The rumors were false

As expected, the rumors about massive violence in flooded New Orleans were highly exaggerated at best, and completely false at worst.
It doesn’t make any difference, though. The people who want to believe those stories will believe them forever, and as long as people believe the stories, everyone who needs an excuse has one readymade.
Sure — some of those stories came from Democrats, and some of those Democrats were black. There’s enough blame to go around. My guess is that in the end Blanco, Nagin, and Bush will all get together and cover for one another, and the whole episode will be forgotten.