Louisiana has been Democrat for a very long time, only interrupted for a short while by Bobby Jindal. So there's that. Also, Louisiana is not the Netherlands,

Louisiana has been Democrat for a very long time, only interrupted for a short while by Bobby Jindal. So there's that. Also, Louisiana is not the Netherlands, the conditions may not be so good, meaning that 'the plan' may be mass evacuation, which is politically a much more challenging thing than saying 'we need to repair the dykes and our nation will be ok'.