I found this article interesting - it compares the Johnstown PA flood of 116 years ago to Katrina. Not a great spin about the elite/rich being to blame, but liken their dam to the levees and the funding that went to other pockets out of selfishness, and you have a decent parallel.
http://hosted.ap.org/dynamic/stories/T/TALE_OF_TWO_FLOODS?SITE=1010WINS&SECTION=US&TEMPLATE=DEFAULT
http://hosted.ap.org/dynamic/stories/T/TALE_OF_TWO_FLOODS?SITE=1010WINS&SECTION=US&TEMPLATE=DEFAULT