Yes, it would have been brilliant to have the school buses above sea level Sunday afternoon.
But, it wasn't stupidity not to.
ANOTHER UPDATE: And it's not just school buses: "Before Katrina hit, the New Orleans Regional Transportation Authority operated at least 364 buses, probably more. . . . Why weren't NORTA's 364 buses used to ferry poor people out of New Orleans before Katrina hit?"
http://instapundit.com/archives/025310.php
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.