If it's proof of stupidity you're looking for, check out;
http://www.cityofno.com/portal.aspx?portal=46&tabid=16
This is the official NOLA website with his evacuation plan and other goodies. This is not hindsight. This is Nagin's foresight.
The page details what to do.
Are you suggesting doing something more?
It costs a bunch of $$$ to take all the people out of the projects and bus them to high ground.
Additionally, you'd already have to have acommodations at the other end.
And nobody dreamed the levee would break.
I just think too much blame is being placed on this poor schm*ck.