Leave the mayor alone. He was being oppressed by George Whitey Bush and could not execute his brilliant plan to overcome Katrina's effects. The man beat him down. Just ask Jesse, Al and the rest of Klan with a Tan.
The reason the police force in New Orleans collapsed is the same reason a thug in Atlanta was able to grab a gun and shoot up a courtroom and then flee the scene--a police department run by incompetents.