Brown Blames 'Dysfunctional' Louisiana - Yahoo! News
FEMA's role may not be to do the evacuation, but they should be coordinating efforts for different agencies. That is communication! They should also be after cities & states in areas that will regularly interface (such as hurricane areas) with FEMA to make sure to make sure there are plans in place to do evacuations and establish lines of communication to stop problems like this.
Plus, I feel it is very bad form to open up comments by blaming someone else for your mistakes. Bottom line is you made an assumption, for right or wrong. That is why you were removed from your job.