It might seem harsh (to some) to raise this right after the hurricane; but after the initial shock those with skills and with ambition will find their own means to survive. They will find jobs and they might very well decide to stay wherever they find 'temporary' refuge. They will move on.
At the end of the day we will find a large group of never functional, addicted, marginally socialized, welfare junkies who are 'unable' to find any alternative to government provided and total maintenance.
We will have a taxpayer supported refugee camp in perpetuity. Our own little palestinian problem. (Maybe it IS time for the UN to take over - they are so very, very, good at managing never ending refugee camps/terrorist breeding grounds.)
That said, I pray that someone in louisiana is planning to aid those folks who made their way onto the overpass and seem to my eye to have earned very little in the way of official concern by their efforts.
Brilliantly sad but true observation.