While the water is filthy, and that cannot be denied, the idea that it's so bad that folks must evacuate is a stretch of the facts IMO.
I don't think it's going to take months to get the area dry. It will take months and likely years to get things back to normal. Folks will be able to live there if they wish. Again, that's my opinion.
One estimate mentioned on Fox earlier today was that the place will be drained in under a month. Quite a difference from the 6 or more months they mentioned originally, perhaps because they got more pumps to work than they thought they could.
I think that instead of sending DPs to strange cities and new lives we should force them back to their homes.