The Post of course leaves out many facts.
Enviornmentalists blocked the corp of engineers in the 70's from building walls that could go up and block off the Lake from the gulf when a storm was approaching.
The earthen levees by the lake stood up well but the residents didn't want them protecting the canals, it would take up too much land.
Residents sued to stop construction that the corp was doing last year to fortify the floodwalls.
Also a barge crashed through the 9th ward, the poor people at the convention center were from that project mostly and no levee system in the world could withstand a barge crashing through it.
Coastal erosion of over 1 million acres of wetlands also has weakened the barrier protection to New Orleans.
I have yet to see it.