So who is to blame? No one! But the well informed people who continue to chose to live in New Orleans and to put their families at risk. The extremely, intellectually challenged New Orleans City Planners continue to defy the basic rules of City Planning 101. Namely, do not build a city on the Gulf Cost of the U.S. in the middle of Hurrican Alley.
Number 2, Do not build a city below sea level, these locations tend to flood often.
When questioned many years ago the original City Planner of New Orleans stated that he "could build a city any where in America that he chose, even on the top of a Volcano. But, because he could not find an active Volcano, he chose the site for New Orleans.
SIDEBAR: There has been a awful amount of publicity these five years after the Katrine disaster occurred, which has been initiated by the residents and City Planners of New Orleans attempting to blame the Army Corp of Engineers, as their scape goats. Hog Wash! Only God could have stopped the New Orleans disaster, but chose not to according to some religious leaders, because of the complete depravity that exists in New Orleans, ie Sodom Gomorrah http://en.wikipedia.org/wiki/Sodom_and_Gomorrah