In Miami and Homestead the first week were bad were there was homes that were left robed. Then the citizens did patrol the area. Everyone did help and worked together which helped a lot of the old. I am not sure that this will happen in an EMP or a collapse of the economy after the first 30 days. Everyone will help in the first 30 days after that if they see it will be years before thing get back to normal I think then the SHTF. When people run out of food and no one is coming to help then thing will change.
But for a hurricane I believe people will always help.