What these separate reports and criticisms indicate is that the government needs to have a fully independent investigation about what went wrong with the Katrina response; one that is not controlled by the Administration. Most importantly, there needs to be one clear and authoritative set of recommendations for avoiding such emergency management breakdowns in the future.
Chalchinsky, Josh, "US emergency management: the Townsend report and its critics" (2006). Macro Center Working Papers. Paper 27.