I don't know about "banned" but I think evacuation should be mandatory. Anyone hoping to ride out a category 4 hurricane in a mobile home needs to rethink that plan.
Mobile home evacuation IS mandatory if a major storm in anywhere in the vacinity -- but authorities do not (yet) drag people out of their homes against their will.
I'm surprised the survivors allowed back in. That's one of the concerns around here. You leave and you can't get back until some government offical declares it "safe". I understand there could be hazards and people can't get in the way of recoveries but this makes a difference if people leave or not. There is a need to get back home and take care of home that seems IMO to be brushed aside. People can be responsible for themselves if they are making an informed decision to go back.
As long as authorities realize that some members of a population that elderly are going to need some hlep evacuating.