"Even if Chertoff signed off 2 seconds after the hurricane passed, it still doesn't explain why Blanco refused them access to the Superdome."
Yep, and you won't hear a thing about Nagin or Blanco and their lack of response and outright refusal to let relief efforts in.
Even the so-called 'investigation' being pushed by some in Congress only focuses on the Federal Governments response and nothing at all is being investigated regarding the City or NO or the State of LA's response.
Congress has no jurisdiction over city and state issues, it does have jurisdiction over Federal issues.