that is hardly an accurate take on his film about New Orleans.
In fact, the documentary has interviews with many of the public officials from New Orleans who were involved in decision making.
It is hardly some conspiracy to know that public policy in New Orleans has been filled with corruption....and for many years.
"All the Kings Men" is a famous film about the controversial and corrupt governor of Lousiana, Huey Long:
Huey Long wiki:
a famous quote by Huey Long runs something like this...when I die, I want to be buried in Louisiana, so that I can remain politically active (in other words, down there they were getting the dead to vote).
So, corruption has long been known to be a big part of Louisiana politics. Hardly some big conspiracy theory proposed by the film.
And everyone down there knew that the levee construction was part of that political scam. Whoever got the money to build and maintain it, was probably using it for the pools in their backyards. Hardly some big secret. Not some big evil conspiracy, but hardly a secret that those levees were put together with duct tape and spit.