I can speak from a hurricane perspective but rebuilding is challenging. First decisions have to be made about your kids and family. If to or three schools are destroyed you likely are going to need to get housing in a district that they can remain in, until schools are rebuilt. If you have family that needs dialysis or medical care, you may have to move to a temporary place until hospital services are rebuilt. You may not have mail service for a while which means you can’t just order something from Amazon. No cell service and no maps means just bringing in stuff is challenging. There no trash service, there may be no water service so even if you want to stay, often you can’t because child protective services or adult productive services can come after you. You really need access to an RV or #van life to stay at your place. Bugs in the south and heat become significant issues. Sanitation services become an issue because there’s no toilet and you can only pee in your backyard so many times before you realize “this is not good” There no local store and there’s likely little to no gas just to get around. It can all be a challenge and in some places it just doesn’t come back. It’s hard to rebuild a town with everyone has to abandon it.