They already know. Cynthia McKinney said a mother of man working in the Hurricane Katrina operations told her that his job was to inventory dead bodies, and he estimated 5,000 blacks, mostly young adult males, had been shot execution style in the head and dumped in a swamp. I wrote a post about this, come read it for the details and links to the story and youtube video of her saying this, and what I think may have happened.

http://keepittrill.blogspot.com/2008/10/katrina-victims-and-gator-food.html