Your post exposes the obvious; Brown is the fall guy for the democrats failure in Louisiana. The idea that we would be asking for accountability from Mike Brown, "before" Mayor Nagin, Governor Blanco...and perhaps more importantly, Terry Ebbert is a joke.
In fact, Ebbert may be the most responsible since he was the city's Homeland Security Director, whose responsibilities were to coordinate regional efforts between the city, state and federal agencies:
http://www.securitymanagement.com/library/001489.html
Yeah, but every single media interview I've seen of Ebbert, they ask him no hard questions.
The media treat Ebbert as if somehow HE were an expert and a Cassandra who forecast the terrible future -- but went unheeded by the eeeeeevil Bush administration.