Katrina, Harvey and Irma
Hurricane Katrina give us lessons about state and local officials being unprepared and expecting the government to rescue them quickly. FEMA and the state and local government's of Texas and Florida did a lot better job preparing and responding to Hurricane Harvey and Irma in 2017 than Louisiana did with Katrina.
I believe the people who tried to ride out the storms do this because they live paycheck to paycheck. They do not have $1000 minimum emergency fund. With that they could leave their house with there pets and go to a motel room and have money to buy clothes and food.
FEMA had several days to stage resources, evacuate and get people into shelters.
When the grid is knocked out FEMA with all its best intentions can not quickly get into states where the power grid has been attacked.